This is Reflexite V82 tape with/without flash:



It trims easily with scissors. You can get it from night-gear.com in small quantities without a minimum order.

Another way to get some reflectivity is tires with reflective sidewalls, and this being the road cycling forum, you might be interested in the Continental Grand Prix 4000 with the reflex (reflective) sidewall. You can get those from BikeTiresDirect.com and Aebike.com, e.g. http://aebike.com/product/continenta...r9359-qc30.htm Nice tire, rated a 25 but comes out closer to a 27 in my experience.