AeroMarine Products’ Beginner’s Mold and Cast kit contains: one quart size kit of our AM125 1:1 Silicone Mold Making Rubber; one half gallon size kit of our White Urethane Casting Resin and one 12 oz aerosol can of Urethane Mold Release. It is everything that you need in one convenient kit! The AM125 Mold Making Silicone Rubber has a simple 1:1 mix ratio by volume. No scale required for this mix ratio. Our White Urethane Casting Resin is a low odor, 1:1 mix ratio by volume casting resin. The Urethane Mold Release will help you demold your part.