STD Super Speed Dance Wheels are made of urethane in Blue 94A, White 92A. Yellow 90A and Green 88 A with PVC inner rim chrome, with diameter 63 mm.  The contact surface with the ground 22 mm.  The narrow profile and the smooth surface allow great maneuverability. They are designed for advanced dance and show performance skaters. Available in  ultralight 63mm diameter.
 
88A Green
90A Yellow
92A White
94A Blue
 
Set of 8 urethane wheels