Pulsar Superglide Premium Glass Mouse Pad ALUMINO-Silicate Glass Surface Anti-Slip Fully Molded high-Density Silicone Rubber 19.3in x 16.5in (XL, Black). Dimension : XL 19.3 x 16.5 x 0.16in 4mm Aluminosilicate glass (Gorilla Glass) with high-density silicone bottom. ALUMINO-SILICATE GLASS Surface - High level of durability and resistance to scratches and cracks and A unique surface pattern. Multi-layered construction - Constructed with several layers of materials to enhance its capabilities and effectiveness. Anti-Slip Bottom - The fully molded high-density silicone rubber design provides maximum adherence to surfaces, ensuring stability and reducing the risk of slips. The ultimate in performance and durability.