The Food Safe Flexible King. it is flexible, chemical resistant, and food-safe. It can make living hinges!POM - The Metal Replacement, it is stiff, strong, and has a low friction coefficient. It's super slick! PMMA - The Crystal Clear, it is the king of optical clarity and UV resistance. It's more transparent than glass! Picking the right material is the foundation of a great product. Remember: There's no "best" plastic, only the best FOR YOUR PRODUCT.