Color: Black 
Length: A4 (21 Rings, Approximate 11-3/4″)
High Quality plastic with glossy finish
Made of rigid PVC plastic
Will not scratch, chip, peel, or discolor
Fit any standard 21 ring comb binding machines
Can be slightly cut to fit the shorter 19 ring binding machine
Work perfect for cookbooks, reports, proposals, calendars, paper, and other companies documents
Per pack of 20'pcs.