---
product_id: 565419617
title: "Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs)"
brand: "fender"
price: "$70"
currency: NZD
in_stock: true
url: https://www.desertcart.nz/products/565419617-patented-callus-builder-and-finger-strengthener-resistance-finger-exerciser-guitar
store_origin: NZ
region: New Zealand
---

# Ergonomic finger positioning Iconic Stratocaster shape Up to 15 lbs resistance Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs)

**Brand:** fender
**Price:** $70
**Availability:** ✅ In Stock

## Summary

> 🎸 Level up your finger game with Fender’s patented callus builder!

## Quick Answers

- **What is this?** Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs) by fender
- **How much does it cost?** $70 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/565419617-patented-callus-builder-and-finger-strengthener-resistance-finger-exerciser-guitar)

## Best For

- fender enthusiasts

## Why This Product

- Trusted fender brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Gift-Ready:** Lightweight and portable—perfect for on-the-go training or as a thoughtful gift for musicians.
- • **Iconic Fender Design:** Officially licensed Stratocaster shape adds style and credibility to your practice routine.
- • **Pro-Level Resistance:** Choose between 8-lb (RED) or intense 15-lb (BLACK) tension for tailored finger workouts.
- • **Strum-Ready Strength:** Build finger endurance and calluses with patented raised ridges that mimic real guitar strings.
- • **Ergonomic Play Simulation:** Designed to mirror natural hand and finger angles for authentic practice sessions.

## Overview

The Fender Patented Callus Builder & Finger Strengthener is a uniquely designed resistance exerciser shaped like the iconic Stratocaster. It features raised ridges that simulate guitar strings to build calluses and finger strength, with adjustable resistance levels of 8 or 15 lbs. Ergonomically crafted to replicate playing positions, it’s ideal for guitar, bass, and violin players seeking improved endurance and coordination.

## Description

Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs)

## Features

- ESSENTIAL GUITAR & BASS ACCESSORY – From beginners to pros, this must-have guitar finger trainer improves strength, coordination, and endurance—perfect for daily guitar training or warm-ups before a performance.
- LICENSED and PATENTED FENDER CALLUS BUILDER – Designed in the shape of Fender’s iconic Stratocaster, this officially licensed guitar callus builder is a standout in any collection of guitar & bass accessories.
- RAISED STRING-LIKE RIDGES – Unlike typical strength training grip strengtheners, this exclusive patented design includes raised ridges that simulate real string tension to help build calluses—ideal for realistic guitar finger exerciser practice.
- MIRRORS PLAYING POSITION – Ergonomically shaped to replicate your hand and finger angles while playing any stringed instrument, making it a versatile tool to build calluses where you need them
- HIGHEST TENSION AVAILABLE – Choose from 8-lb (RED) or 15-lb (BLACK) resistance. The BLACK version delivers extreme resistance—unmatched by any other guitar finger trainer or hand exerciser on the market.
- PERFECT HOLIDAY GIFT & STOCKING STUFFER – A thoughtful holiday gift that shows you support their musical journey. The ideal add-on for anyone receiving a new guitar! Compact, affordable, and fun to use — musicians of all ages LOVE this in their stocking.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Color | Black |
| Material | Plastic |
| Brand | Fender |
| Item Weight | 3 Ounces |
| Style | Standard |
| Tension Level | Heavy |
| UPC | 891922002223 |
| Manufacturer | Barrett Productions, LLC |
| Item Package Dimensions L x W x H | 6.81 x 3.86 x 2.01 inches |
| Package Weight | 0.12 Kilograms |
| Brand Name | Fender |
| Warranty Description | No. |
| Model Name | Fender Callus Builder |
| Part Number | 891922002223 |
| Size | 15-Lb |

## Product Details

- **Color:** Black
- **Material:** Plastic
- **Brand:** Fender
- **Item Weight:** 3 Ounces
- **Style:** Standard

## Images

![Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs) - Image 1](https://m.media-amazon.com/images/I/71LM2OwHkLL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Frequently Bought Together

- FENDER Patented Callus Builder & Finger Strengthener – 15-lb Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories
- D'Addario Accessories Hand Exerciser–Improve Dexterity and Strength in Fingers, Hands, Forearms- Adjust Tension Per Finger– Simulated Strings Help Develop Calluses- Comfortable Conditioning
- Rock Tips Liquid Callus Formula for musicians

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**Shop now:** [https://www.desertcart.nz/products/565419617-patented-callus-builder-and-finger-strengthener-resistance-finger-exerciser-guitar](https://www.desertcart.nz/products/565419617-patented-callus-builder-and-finger-strengthener-resistance-finger-exerciser-guitar)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-14*