I found a web-site with that black in the day, bright white at night reflective tape. Here it is; http://www.reflectivelyyours.com/

Cool...good find.

Couple of other places too if you want to design your own.. they sell sheets of the reflective
http://www.reflectivedecals.com/
http://www.ridesafer.com/main.php3?primNavIndex=1& (Click the shopping tab along the top then look for refective tapes along the left menu)