I. Product Specifications Material: High-density silicone Thickness: 5mm Heat Resistance: Up to 428°F Sizes: 7.87″x3.35″ (2pcs), 6.50″x2.60″ (2pcs) Set Includes: 4pcs heat press pad II. Product Features This premium heat press mat set is made of durable, thick silicone that distributes heat and pressure evenly.