The new OJ Insane-A-thane series are here! The Dolphin team series comes on our EZ-EDGE shape. EZ-EDGE has a rounded edge and narrow riding surface for maximum speed on any surface and control on grinds. Insaneathane: Insanely tough urethane and OJ Wheels’ most durable formula yet. Super fast. Slides Excellent. Grips in all the right places! .