14Pcs 7 Size 304 Stainless Steel Plain Band Rings Set, Electrophoresis BlackSize: 304 Stainless Steel Plain Band Ring1: about inner diameter: 16.5mm, 8mm wide, 2pcs; 304 Stainless Steel Plain Band Ring2: about inner diameter: 17.4mm, 8mm wide, 2pcs; 304 Stainless Steel Plain Band Ring3: about inner diameter: 18.2mm, 8mm wide, 2pcs; 304 Stainless Steel Plain Band Ring4: about inner diameter: 19mm, 8mm wide, 2pcs; 304 Stainless Steel Plain Band Ring5: about inner diameter: 19.9mm, 8mm wide, 2pcs; 304 Stainless Steel Plain Band Ring6: about inner diameter: 20.7mm, 8mm wide, 2pcs; 304 Stainless Steel Plain Band Ring7: about inner diameter: 21.5mm, 8mm wide, 2pcs; Plastic Bead Containers: about 16.5x8.5x1.6cm, 1pc.