Reflexite R99 Railway/Rail Car Retroreflective Conspicuity Tape. Ordered the white 4" x 15' from Amazon for about $40. WAY more than I need but super reflective, extremely sticky, and very flexible. Claims a 10 year warranty for rail car use. I'd say that's durable. I wrapped my front shocks on my converted-to-commuter MTB. When illuminated they glow like beacons and are visible from every angle. I'm planning on applying some to rims. I do think you get the most benefit from applying to moving parts, i.e cranks, wheels. Overall extremely reflective and durable (there are some comparisons and tech data out there if you have the time/urge to google away). Very happy with this stuff. Hint: Bike shops should carry.