The DWP-125-1-0-STK is a black flexible medium-wall Heat Shrink Tubing made of adhesive-lined irradiated modified polyolefin and offers 3:1 shrink ratio. The tubing is a versatile, environmentally friendly choice for many commercial applications that require mechanical protection and sealing against moisture and chemical ingress. The tubing is used for environmental sealing and protection of irregular shapes, such as wire splices and break-outs, in demanding industries such as appliance and satellite communication. Tubing has an outer jacket of radiation-cross-linked, flexible, flame-retardant polyolefin. The tubing is free of polybrominated biphenyls (PBBs) and polybrominated biphenyl oxides (PBBOs). DWP-125 shrinks, the inner adhesive liner melts and flows to seal and encapsulate components or splices contained within. Because it has a 3:1 shrink ratio, only a few sizes are needed to cover a wide range of substrate diameters, enhancing inventory efficiency.