JOTW Silvertone Layered Multi Chain with Neon Yellow Chain Iced Out ID Bar Adjustable Necklace Jewelry Set (B-2878) The Silver Cuban Chain Measures 7.6mm and adjusts from 15-18 inches. The Cocoon Chain Measures 4.3mm and adjusts from 16-19 inches. The Yellow Cuban Chain Measures 9mm and adjusts from 18-21 inches. The Ball Studs Measure 10mm.