Traditional flax packing that can be cut to a desired length.Premium Square Marine PTFE Packing is designed to protect the propeller shaft and prevent overheating or leaks. This square cross-sectioned rope is packed or wound tightly around the propeller shaft,and compressed in place with a threaded nut and spacer creating a leak-free propeller shaft. Comes in three footlengths. Key FeaturesProtects propeller shafts and prevents the bilge from filling with waterDissipates heat away from the stuffing boxThermal conductive material allows the propeller shaft to run cooler and efficientlyWill not scar, bind, freeze or contribute to misalignment of shaft