3M™ Flexible Prismatic Retroreflective Sheeting 3311i, Yellow, 4 in x 100 yd. 3M™ Flexible Prismatic Retroreflective Sheeting Series 3300i is a sheeting pre-coated with pressure sensitive adhesive. It is designed for reflectorizing rigid or reboundable traffic control devices such as barrels, drums, and similar channelizers.