Product Description: Material: Steel Applicable To Industrial Single Needle Lockstitch Sewing Machine Diamond Wheel:Suitable For Medium Thick Fabrics Such As Home Textile Curtains, Etc Iron Gear Wheel:Suitable For Thick Fabrics, Thickened Cotton Clothing Products, Etc Rubber Wheel:Suitable For Thin Down Jackets, Leather, Silk And Other Fabrics Plastic Gear Wheel:Suitable For Hard Leather Fabrics, Etc Notice: 1 Due To The Light And Screen Difference, The Item&;s Color May Be Slightly Different From The Pictures Please Make Sure You Do Not Mind Before You Bid 2 Please Allow 1-5mm Differences Due To Manual Measurement 3 Thank You For Your Kindly Understanding