America standard flexible ducting am-ds1225 with cinch straps 12" x 25'features: Industry standard quality ducting for everyday use. Single ply, pvc vinyl-coated polyester fabric with 15-gage spring steel wire helix and external pvc wear strip pvc coated polyester fastening cuffs at both ends with industry standard spring buckle cinches flame retardant available in 8" (15', 25'), 12" (15', 25') and 20" (25') sizes integrated carrying bags available with 8"x 25', 12"x 25' and 20"x 25' ducts.