Continuous Coil Zipper is sold by the foot. Full roll discount applies to a reel of 2460.63 feet.
YKK® #3 Continuous Coil Zipper- Black #580 , 2460.63ft/reel and has a 1/2 inch tape. Other colors available when purchasing a full reel. 3 coil = ~ 3mm width (.165 in or about 5/32 in)