Spiny Shells are red spiked Shells worn by Spinies. Mario or Luigi can't jump on the Shell unless they ump on the underside or use Yoshi or a Goomba's Shoe. In Mario Kart games a Spiny Shell with wings called a Blue Spiny Shell is used as an item. It attacks the driver in first place. A spiny shell can also be worn by blue Spinies too, but only have wings.