Rock-Tips – Liquid Callus Formula – For Guitar, Bass, and Other Stringed Instruments – 4.0 mL sold2025 more to come in the

more to come in the future

are made of soft Felt Blend

No stimulation to skin

reduce eye pressure

and then use

Rock-Tips – Liquid Callus Formula – For Guitar, Bass, and Other Stringed Instruments – 4.0 mL sold2025 more to come in theRock Tips Liquid Callus Formula For Guitar, Bass, and Other Stringed Instruments 4. 0 mL Rock Tips Liquid Callus Formula is based around a medical adhesive, which is designed specifically for use on human skin. With additional polymers added for flexibility and strength, our proprietary formula acts and feels like a hardened layer of skin, with the toughness and flexibility of a real callus. With Rock Tips, you can play your instruments longer without