https://www.ebay.com/sch/i.html?_nkw=3M+Nst+3+Black+Shrink+Tubing+3+000+In+Id+Black+50+Ft&_sacat=0&_dmd=2

3M Nst-3-Black Shrink Tubing, 3.000 In Id, Black, 50 Ft

Regular price
$617.00
Sale price
$450.00

Heat Shrink Tubing, Material Modified Chlorinated Polyolefin, Temp. Range -94 Degrees to 250 Degrees F, Shrink Ratio 2:1, Black, Length 50 ft, I.D. Before Shrinking 3.000 In, I.D. After Shrinking 1.500 In, Wall Thickness After Shrinking 0.125 In, Max. Voltage 600V, Standards MIL-R-46846, Type I, Class 1; MIL-DTL-23053/1, Class 1, 2; AMS-3623