TE Raychem is a subdivision of TE that specializes in materials, among them useful varieties of heat shrink tubing. One offering they sell is RNF-100-3/8-BK-FSP, which has produced questions on the meaning of the ‘FSP’ suffix in the part number. Does this affect the product?
“FSP” means “Flat Spool Product”, which is sold by the meter. It doesn’t otherwise affect the product’s specifications.