Fill silicone cups with batter, place on cookie sheet and bake as directed. After cooling, turn over the cups and pop out your delicious blueberry muffins or chocolate cupcakes. Nothing sticks and cups can be used over and over. Each cup measures 1-3/4" dia. on bottom and 2-1/2" on top and is 1-1/4" high. Set of 12 contains 6 red and 6 blue cups. Stain/odor resistant and dishwasher safe.