High quality food grade material. This sponge holder is completely made of non-toxic, BPA-free food-grade silicone material, which is durable and not easy to deform. You can use this sink rack on your kitchen or bathroom sink to make it dishwasher safe.This sponge holder is designed to hold all standard Smiley sponges as well as any Smiley limited edition sponges. Compact size, saving space. The sponge holder can be installed neatly anywhere in the sink, freeing up countertop space! This sponge holder eliminates the need to worry about messy and wet sponges on your kitchen or bathroom sink. All your sponges will be neatly arranged on the sink. Easy to install. Please clean the sink and keep it dry before picking up the sponge holder. Then, press the sponge holder to the sink surface and squeeze out the air to secure it firmly. Just place your smiley face sponge on the sponge holder. Powerful Suction CupThe sponge holder can be adsorbed on any clean and smooth surface, such as mirrors, glass, ceramic tiles, stainless steel plates, iron plates, aluminum plates and plastic plates. Applying petroleum jelly to the suctioncupsworksbest, especially for stainless steel sinks. Note:Not suitable for painted walls, rough surfaces and wallpapers. Carefully designed structure. Thanks to the open design of the sink rack, the sponge can drip dry and stay clean. Plus, the sponge holder can be quickly cleaned and kept dry while washing dishes. Great for kitchen, workplace, bathroom, craft room, lab,classroom or office sink.