We R Memory Keepers Cinch Elastic Binding Bands 12-pack. These bands include six 8" (20.3cm) bands and six 4" (10.2cm) bands. The 8" (20.3cm) bands come in white, yellow and pink. The 4" (10.2cm) bands come in black, aqua and lilac colours. These bands can be used with the Band Punch Cartridge and the Multi Cinch tool (sold separately) to add an elastic band binding to your books and other projects.