Urethane is a plastic that gives a slight bit while you press against it. Works to press metal into when you are forming metal with a bracelet former kit or mushroom former. Urethane comes in various durometers of softness/hardness.
3 inch diameter x 1 inch thick, 75 durometer urethane insert. Can be used with or without a container. If over-squeezed without a container, it will crack. COLOR WILL VARY.
2 inch diameter x 1 inch thick urethane, 90/95 durometer. Can be used with or without a container. If over-squeezed without a container, it will crack. COLOR WILL VARY.
3 inch diameter x 1 inch thick, 90/95 durometer urethane insert. Can be used with or without a container. If over-squeezed without a container, it will crack. COLOR WILL VARY.