Sure Grip Twister Swirl Quad Indoor Speed Roller Skate Wheels - Your Choice of Colors! - Twister - the classic - from the skate experts at Sure Grip. Psychedelic swirly colors! Sold in a 8 Packs of Wheels! Your ticket to a wild ride! Blow away the competition with the coolest wheels around! Feel the natural power of American urethane on a lightweight nylon core. Swirl on baby! 62mm x 42mm in 96A Hardness (Firm but definitely with a bit of Grip!)