Double layer, stainless steel choker chain necklace with steel O ring. Features a heavy duty stainless steel chain and a smaller stainless steel chain with steel O ring. Lobster clasp closure. Specs Big chain: Full Length 16" inches (closed 8" inches) Has a two inch extension chain for size adjustment Width 7mm Material: stainless steel Small chain: Full Length 18" inches (closed 9" inches) Width 3mm Material: stainless steel O Ring: Length 1" inches Width 1" inches Thickness 3mm Material: steel