Life Safe: Road Smart Rectangle Stick-On Reflectors High-Visibility, 2" x 3.5", Red (Pack of 2) Highly reflective prismatic lenses in a durable transparent resin Reflector dimensions: 2" W x 3.5" D. -Overall dimensions: 0.5" H x 4.3" W x 6" D Used for trailers, automotive, driveway posts, mail boxes, recreational vehicles, farm machinery, bicycles, helmets and snowmobiles