Special compressed urethane sponge that is scratch resistant and can be cleaned thoroughly. Made with microcell membrane sponge that allows air to pass through and dries quickly. It will quickly become fluffed with a small amount of detergent, and it also has good foaming capabilities, so you can reduce the number of times you need to refill the detergent. It also has good bubbles when rinsing. It is hygienic because it is easy to remove dirt from the sponge itself. Uses thick ester sponge with no abrasives and improves cleaning power without scratching. It is durable and does not flatten easily, making it last longer than conventional sponges. Size: Approx. 2.4 x 1.3 x 4.7 inches (6 x 3.2 x 12 cm) per piece; Weight: Approx. 0.3 oz (9 g) per piece); Heat resistant temperature: Approx. 198°F (90°C); Material: Polyurethane foam. Country of Origin: Japan