GMP Continuous Duct Rodders are high-visibility fiberglass rodders available in 1/4", 3/8" and 1/2" diameters and multiple lengths. Designed for cleaning and locating ducts, threading lines, and pulling cable, GMP rodders are available as standard or detectable (toneable) versions (detectable models include an 18 AWG copper conductor embedded in the core). When mounted on GMP tubular steel, powder-coated carriers (some with inboard wheels and large airless tires), the rodders provide stable payout and retrieval with a hand-operated brake. 3/8" x 500 ft models have representative carrier dimensions 35" L x 13.5" W x 40.5" H, cassette diameter 33.5" and an approximate weight of 82 lb. (manufacturer product page and catalog).