Features: 1) Diameters available: a) 1.1 / 4 (6mm), 2.5 / 16 (8mm), 3.3 / 8 (10mm) b) 4.7 / 16 (11mm), 5.1 / 2 (12mm), 6.9 / 16 (14mm) c) 7.5 / 8 (16mm), 8.11 / 16(18mm), 9.3 / 4 (19mm) d) 10.13 / 16 (20mm), 11.7 / 8(22mm), 12.1 (25mm) e) 13.1 - 1/8 (28mm), 14.1 - 1/4(32mm), 15.1 - 3/8 (35mm) f) 16.1 - 1/2 (38mm), 17.1 - 3/4 (45mm), 18.2 (51mm) 2) Colors available: black, white, yellow, clear, blue, red, green (call for specialized colors) 3) Rings available: 19, 20, 21 (call for specialized rings) Inner packing: White strong box 1) 6mm - 20mm: 100pcs/box 2) 22mm - 51mm: 50pcs/box Outer packing: 10 boxes/carton