These Polytek® mixing cups are easy to use. First, choose the right size cup based on how much material you need to mix. Pour the Polytek® rubber or plastic into the cup. Use the printed measurements on the cup to get the right mix ratio, like 1:1 or 2:1. Stir well until the materials are fully blended. Remember, the cups and lids are sold separately, so make sure you have both if you need a lid. After use, clean the cup with a mild soap and water. Let it dry completely before storing. Keep the cups in a cool, dry place to make them last longer.