This Hyper Reflective Vintage Swirls decal set comes with 4 decals. Each decal is 4-1/4" long and 3/4" high. They are designed to fit perfectly on your bike frame or vented bike helmet. But you can apply them to any smooth hard surface like your bike helmet, or motorcycle helmet. The set is shipped on a sheet that is 3-1/2" wide and 5" high. This Reflective Vintage Swirls decal set is made with Genuine 3M, Automotive Grade, Retro Reflective Safety Vinyl. This is the same reflective decal material used on police cars and fire trucks. They look like regular decals in the daylight, but at night they glow under flashlights and headlights.