it's plain old painters tape (blue masking tape) and it comes right off ...I've never seen or heard of it damaging paint or anything underneath. It gives some protection from small chunks of things flying up around the track, pebbles, rubber, etc. Won't protect from big chunks of course.
Nick '95 6sp APU
PHR1 turbo on IM cast mani w/HKS 60mm GT WG + PHR Stg2 fuel/850cc's + ExtremeTurboSys FMIC + gForceECU + MAP ECU + FJO/NTK + Racelogic TC + Tein HA's + TRDgen2 + Veilside EvoV wheels 18"X 9-1/2"F, 10-1/2"R + HKS triple disk clutch w/ HKS lwfw + Carbotech pads stock rotors