CFHKStore 150Pcs Black Polyolefin heat shrink tubing assortment Big collection of heat shrink tubing,8 Specifications Supplied internal diameter: 1.0mm,2.0mm,3.0mm,4.0mm,6.0mm,8.0mm,10.0mm,13.0mm minimum Fully shrunk internal diameter: 0.5mm,1.0mm,1.5mm,2.0mm,3.0mm,4.0mm,5.0mm,6.5mm maximum Shrinkage Ratio: 2:1 (will shrink to 1/2 its supplied diameter) Material: Polyolefin Flammability: Flame Retardant