Medium wall black heat shrinkable tubing shrink ratio 3:1 halogen-free, medium wall, yet flexible standard electrical heat shrinkable tubing with shrink ratio 3:1 (shrinkability to one third of the specified inner diameter before heat shrinkage), very suitable for electrical insulation, as kink and abrasion protection, for sealing as moisture protection, for bundling, for strain relief and for marking in electronics and electrical engineering, telecommunications, cable harnessing, in the automotive sector, etc. , thanks to shrink ratio 3:1 especially suitable to compensate large diameter differences of the object to be shrink wrapped, e.g. strongly contoured parts like connecting sleeves, plugs and switches, as well as to cover a wide range of applications with only a few shrink tubing sizes, on dispenser rolls, stable, environmentally friendly cardboard rolls, diameter approx. 300 mm-550 mm (per shrink tubing size), core hole diameter approx. 30 mm, especially for industrial use, shrink range 0, 7-1, 3 mm, before shrink diameter 1, 6 mm, length 200 m