This is a 1 meter length 90mm black PVC heat shrink tubing from ProTek R/C.
ProTek R/C is an AMain Sports & Hobbies brand.
Thursday, Jan 3 2013 (about 8 years ago)
ProTek RC 90mm PVC Heat Shrink Tubing (1 Meter)
This shrink is very good at covering 3s 5000mah lipo batteries or 7 cell nimh. but before you do anything caution this shrinks around your battery very fast! keep the heat moving so it doesn't buckle if its your first time buy plenty. Also you don't need a heat gun for this stuff if you don't have one i used my stove.