Just for the car or truck? Heck no! The uses for our car smellies are endless!!! Hang them in the basement, closet, by the litter box, or put them in your knitting/crochet bag, diaper bag or in a dresser drawer . Any place you need a good smell... that's where you need a Car Smellie! Our car smellies are made with a plastic bead that is made for this application. They shouldn't melt, however, in the heat of summer, in direct sunlight, or in a closed up vehicle for hours, they may. The softening/melting point of the polymer in the bead is 140-160 degrees.