One invisible zipper 12" length; Size #5 Closed-end zipper; easily shortened from the top or bottom of the zipper Sturdy polyester tape with a small "BIAS" engraved into the metal puller for our Bias Bespoke brand Size #5 invisible closed-end zippers. They're on a sturdy polyester tape with a small "BIAS" engraved into the metal puller for our Bias Bespoke brand. Sold in 12", 16", 20", 24", and 28" lengths and easily shortened from the top or bottom of the zipper.