Tupperware Silicone Baking Mat. Flexible silicone acts as a liner for cookie sheets, and baking pans. Non stick surface never needs greasing. Doubles as a pastry sheet with guidelines for rolling out dough or pie crusts up to 9”. Silicone material provides even heat distribution and cools quickly when removed from oven. Freezer, microwave and oven safe up to 425. 16 1/2”L x 11 1/2” W. Cleans up with hot, soapy water.