https://www.ebay.com/sch/i.html?_nkw=3M+Itcsn+3000+12+Bulk+Shrink+Tubing+3+In+Id+Black+12+In+Pk+50&_sacat=0&_dmd=2

3M Itcsn-3000-12-Bulk Shrink Tubing, 3 In Id, Black, 12 In, Pk 50

Regular price
$776.00
Sale price
$571.00

Heat Shrink Tubing, Material Cross-Linked Polyolefin, Heavy, Temp. Range -67 Degrees to 230 Degrees F, Shrink Ratio 3:1, Black, Length 12 In, Wire Range 600 to 1250 kcmil, I.D. Before Shrinking 3.000 In, I.D. After Shrinking 1.000 In, Wall Thickness After Shrinking 0.170 In, Max. Voltage 1000V, Features Thick Wall Top Resists Puncture and Abrasion Damage, Versatile, a Minimum Number of Sizes Cover the Entire Range of Applications, Standards UL Listed File E-102356 and CSA Certified