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 the pain. This allows your fingers to build up a natural callus while being protected by Rock Tips. It also helps repair damage caused by playing without liquid or natural calluses by protecting and rebuilding damaged, peeling, and torn fingertip calluses. A typical application of Rock-Tips will provide you with one to two days of active playing making it perfect for extensive practicing or major gig. There are over 150 applications per 4.0mL bottle giving you enough liquid calluses for an entire tour with your friends including practices, gigs, and causal play time. Rock-Tips is tough stuff, and lasts as long as you need it. Once you're done, you can scrub it off with soap and warm water. It's nontoxic so it's safe to leave on your skin for periods of time. It's perfect for all levels of instrument players, from beginner to professional use. To use Rock-Tips make sure fingertips are clean and dry. Lightly brush Rock-Tips on fingertips and let dry for 1 minute before playing an instrument. If an additional coat is needed, simply brush another coat on and wait another minute. Wears away naturally in 1-2 days or scrubs off with soap and warm water. Package contains (1) Rock Tips Liquid Callus Formula in 4.0 mL bottle good for over 150 applications. Non - Toxic. Long Lasting.