Tubes are strong and durable. Sizes 0 through 5 (5/64", 3/32", 1/8", 9/64", 5/32" and 11/64"). Each set includes six interchangeable tempered steel tubes and forged steel handle. Each set includes six interchangeable tempered steel tubes and forged steel handle. (Additional replacement tubes #3798.) Use Cutting Board to help protect your tools and your table top.