High-performance super sponge tire set: Super Soft X5, Soft X2, for F1 radio control cars. Thank you for viewing. This is a sale of used ZEN sponge tires, Rear Super Soft (5 sets) and Rear Soft (2 sets). These were purchased and stored in a dark place at home. Although they are new and unopened, they may have deteriorated in performance as it has been over a year since purchase. Please understand this before purchasing. As these are used items, no claims or returns are accepted.