https://www.ebay.com/sch/i.html?_nkw=3M+Fp+301+1+2+Black+4+Bulk+Shrink+Tubing+0+5+In+Id+Bl+4+Ft+Pk+100&_sacat=0&_dmd=2

3M Fp-301-1/2-Black-4'-Bulk Shrink Tubing, 0.5 In Id, Bl, 4 Ft, Pk 100

Regular price
$174.00
Sale price
$117.00

Heat Shrink Tubing, Material Flexible Polyolefin, Thin, Temp. Range -67 Degrees to 275 Degrees F, Shrink Ratio 2:1, Black, Length 4 ft, I.D. Before Shrinking 0.500 In, I.D. After Shrinking 0.250 In, Wall Thickness After Shrinking 0.025 In, Max. Voltage 600V, Standards UL Recognized (No. E-39100, E-69751) and CSA Certified (No. LR38227). MIL-I-23053/5, Class 1. AMS 3636 (Type I) and AMS 3637 (Type II), Package Quantity 100