They are self adhesive and high vis green but they are not reactive "Convenient, self-adhesive Birchwood Casey 6in Target Spots create instant bull's eye for all types of target practice! The high-contrast, fluorescent color of the Birchwood Casey Gun Target lets you see a sharper sight picture and bullet holes more clearly for better scores and smaller groups. These newly designed targets come in highly visible atomic green. The crosshair design fulfills the needs of open sight shooters along with scope users. Easily line up your open sights on the center square or lay the crosshairs along the vertical and horizontal diminishing lines. As an additional option, turn the Birchwood Casey Shooting Target slightly to position the crosshairs in an "X" pattern."