The Durometer surface is soft 78A urethane while the core is hard 78D ! The hard core keeps a true round making this wheel Super bouncy and fast. Even rough surfaces feel like smooth warehouse floors. Ricta clouds are perfect for filming and they are center set like all skateboard wheels so they don't stick out from under your board catching your foot on the push.
-Center set
-74A 78D

Sold in sets of 4.
Bearings and spacers not included.