These mats are made from PTFE coated fiberglass fabric( The PTFE is PFOA free from Daikin) Oven,Microwave, Freezer, & Dishwasher safe. Can stand up to 500â?° F . Non-stick on both sides. Cut into any size as required. 13? x 15.75?, 0.2MM Thick, 370G, Black. FDA & SGS Approved, Safe for Food.