Plastic - Plastic is a synthetic polymer best known for its rigidity. The most common plastic is ABS, which stands for Acrylonitrile Butadiene Styrene. Plastics are durable with a high impact resistance. Use soap and warm water or toy cleaner to disinfect.
Silicone - Silicone is a synthetic compound best known for its ability to retain heat. Silicone is non porous which makes it hypoallergenic and easy to clean and sterilize by boiling or putting it in the dishwasher. Silicone has no detectable odor.