- Large grid for accurate measurements. This 24×14.5x.5 inch package contains one 14×23 inch glass mat with 12×14 inch measuring grid area, 7.5×11 inch mixing palette area and 7.5×11 inch removable non-stick mat with heat resistant surface. CAUTION: This product is made from tempered glass and is to be used for cutting surface only. Do not drop or hammer directly onto the glass surface. Imported.