WidgetCo 6mm (1/4") Cork Underlayment Sheets are made from natural cork. Cork Underlayment is a natural sound insulator and will work with both wood floors and tiles to help reduce walking noise and act as a thermal insulator. Cork natural properties resist mold and mildew. Each sheet is 6 sq. ft. (6mm x 2' x 3'). Each box contains 16 sheets or 96 sq. ft. Cork Underlayment Sheets install quickly and easily and do not curl up as can occur on underlayment rolls. Bulk available.