Slightly more expensive than Kama, but stands the test of time considerably better. Skated for two years with no noticeable flaws. Brake dust had already removed some spots on Kama. A miser would probably buy many sets of inexpensive ones, but I've been riding Pirelli for years. Hired Experts: Soft rubber provides excellent traction. In addition, it rides smoothly over bumps. Pebbles get lodged in the tread and start to click, which is a different disadvantage. But I can't say for sure if that's a drawback. The very deep tread appears to be the culprit.