Thermo-Loc is a special reusable polymer material that is rigid at room temperature yet becomes pliable when heated or warmed. Developed to hold irregularly shaped or fragile items, Thermo-Loc can be used on firearms, knives, wood, and more. Supplied in convenient 6" (150mm) long sticks, Thermo-Loc is a medium gray color designed to reduce eye strain under work lights. It is non-toxic and biodegradable. Very tough work-holding plastic. Softens with heat to clay-like pliable consistency so you can form it around an endless variety of work pieces. Turns rock-hard once it cools to hold items securely. Thermo-Loc is developed to hold irregularly shaped or fragile items, Thermo-Loc can be used for holding rings, bracelets or just about anything. To use, simply warm Thermo-Loc in hot water, or the microwave, or with a hot air gun until it is pliable. Then place the item to be held on the pliable Thermo-Loc and fold over the edges of the Thermo-Loc to hold the piece in place. Economical and practical—can be reused again and again. Supplied in 4 different size packages: 0.25 Lb (112.5 g) 0.5 Lb (225 g), 1 Lb (450 g), or 5 Lb (2-1/4 Kg). Please choose.