These neck cords are made of 2mm black color leather-like materials. Each of these black neck cords is closed by a silver color lobster clasp, with a 1.5"-long extension chain allowing them to adjust from 18" to 19.5". These come with a 25mm Pinch Bail (13mm internal). Pinch bail together with prongs on front drilled components such as our Snowflake Component for instant necklaces. Bail slides off if you choose to use the necklace with an existing pendant.