There are 4 sizes in one package: you will get 4 pieces of 2.95 inch/7.5 cm diameter whisker foam cups, 4 pieces of 3.15 inch/8 cm diameter cup foam cups, and 4 pieces of 3.54 inch/9 cm diameter whisk foam cups and 4 pieces of 3.94 inch/10 cm diameter whisk foam cups; 4 sizes in total, 16 sponges for you to choose. High-quality material: our products are made of high-quality memory foam, soft touch and good elasticity; not easy to break and deform, can be used for a long time, soft enough to fit different cup shapes, providing you with a safe and reliable experience. Bonus Tip: After receiving the cups, please unpack them and let them rest until they recover their shape. Perfect Friction: Grip the cup from the inside, keep the cup rotation stable, easily adjust its position in the cup, which will bring you more convenience. Fits 1/2 inch (about 1.3 cm) PVC pipe: This cup stirrer foam will perfectly fit 1/2 inch (about 1.3 cm) PVC pipe, which means your PVC pipe should have a diameter