Dread cuffs come in packs of 20 and measure about 10 mm in diameter when they're completely closed. They're easily bendable, though, so you can squeeze them onto larger dreads if you leave a small gap in the back, or you can double up two at a time and make one really big cuff instead.
Size: 10 mm x 8 mm.
Brand: I Kick Shins.
Color: Rainbow: a mix of red, gold, green, blue, purple, magenta, and silver.