Metal: 18k Recycled Gold Plating and E-coating on BrassChain Width: 3.0mmS/M Total Length: 18.5cm, adjustable from 16.5cm to 18.5cmWeight: 2.5g M/L Total Length: 21.5cm adjustable from 19cm to 21.5cmWeight: 2.8g Water-Resistant 316L stainless steel Anti-tarnish Sweatproof Hypoallergenic Product Code: LV-G-B4-NS-S-OP