solid sterling silver chain with slider bead function at end , will adjust from 22 inches to any measurement smaller than that , simply slide the bead along to suit. Also you can easily add any charms or beads that have a hole as big as the chain itself - (1.3mm ) by sliding them on the end stick and then sliding back on the slider bead. The slider bead has silicone inside to grip the chain. the chain has a 925 mark.