【Premium Metal Construction】 Crafted from durable copper and quality metal, these snap fasteners resist rust, corrosion, and deformation while maintaining a smooth, polished finish through repeated use and machine washing. 【Complete 24-Piece Set】 Includes 24 sets each of 20mm and 21mm black sew-on snaps - ample quantity for multiple projects, replacements, or sharing with fellow crafters. 【Universal Fabric Compatibility】 Perfect for jeans, leather goods, backpacks, shoes, and various DIY projects on multiple fabric types including PU leather and heavy-duty materials. 【Simple Sew-On Application】 Features a straightforward two-part design that easily buckles together after sewing - no special tools required for secure fastening. 【Multi-Purpose Fastening Solution】 Ideal for clothing repairs, bag closures, craft projects, and household items - combines functional durability with discreet, professional-looking results.