Glass Counter Savers are made of 5 mm thick tempered glass and are shatter resistant and heat resistant up to 450º. Counter Savers are safe to use with bakeware directly from the oven, and ideal for food prep and serving. The smooth, non-porous surface resists stains, scratches and bacteria. Non-skid rubber feet protect counter surfaces. Counter Savers measure 16" x 12". Dishwasher Safe.