Each sterling silver chain comes with a lobster clasp and is ready to wear. They would make an ideal gift for him or yourself. All jump rings are soldered closed. Material: solid sterling silver A: curb chain, 7.4 x 4.4mm (width x thickness) B: flat curb chain, 7.7 x 3.6mm (width x thickness) Length: 20" is ready to ship. (Other lengths are available upon request.) Size of the jewellery cleaning cloth: 5"x7"