1. 100% nylon fabric and brush back. 2. 16-year manufacturer 3. Other material for back button 4. Any sizes and colors option ... , stainless steel, 1mm stainless steel5. Stitch:Visible stitch, hidden stitch, back no stitch6. Cutting:ultrasonic cutting, M&S soft edge cuttingAs ... experiences, we canguarantee the quality and the after service. Bra back button