Detailed Product Description 1), Material: Brass, nickel free2), Cap size: 10mm, 12mm, 13mm, 14mm, 15mm, 17mm, 18mm, 20mm etc.3), Make up of four parts: cap, socket, stud, post( open post and close post)4), Can make your own logo on the cap and socket5), Common plate color is available6), High quality, reasonable price, best services.7), Suitable for garments and other accessories.