available color: black, white red blue yellow green clear rings: 19rings 20rings 21rings size: diameter from 4mm to 51mm suitable for page from 1 to 450 pages. advantages: its the new environment protactive product. page will be flat after turning. can add or remove pages. its easily for binding. the book will be more stable after binding.[...]

sorts: clear / matte multi-color available thickness: 0.1mm 0.125mm 0.15mm 0.175mm 0.2mm 0.25mm 0.3mm 0.4mm[...]

pitch:3:1 or 2:1 dir-meter:4.7mm to 25.4mm multi-color available[...]