This stainless steel ring with fixed bead comes in various diameters, from 10mm (3/8”) through 16mm (5/8″). All sizes come with 4mm or 5mm stainless steel ball (depending on the diameter). The ball is welded to the ring, it’s great for those that want a captive bead ring, without the hassle of having to put in or remove the ball. The material is Annealed 316L Stainless Steel. Annealed means that is is soft and easy to bend making it relatively easy to take on and off.