The Adult Extreme was engineered and designed as a Rental Skate. Unibody construction eliminates the possibility of plate and boot separation. Maintenance is therefore reduced without sacrificing performance. Cambrelle Plus Liner which has carbon fiber woven in for antibacterial – no odor properties. All of the major parts can be easily replaced with a screw driver or allen wrench. If the parts on your rentals are attached with rivets, then chances are your skates were not Designed as Rentals.