The prices of heat shrink tubing vary quite a bit but there are real outliers. For example, Rapid sells two types of 4.8 mm x
1.2 m with similar characteristics (2:1, polyolefin, etc.). The Shrinktek is at 0.912 GBP, the "RVFM" house-brand at 0.164 GBP. What corners do they cut to make it five times cheaper than everyone else ?