silicone lip material:100% food grade silicone with SGS approved. Hardness:40,50,60,70,80 shores according as you requested. Durable,non-stick,easy to cleanup. endure temperate from -40 to 230 degree C. can be folded for storage,easy to release. microwave,oven and dishwasher safe. any shape and color available. excellent flexibility and versatility. oem service available.