The SFR Pulsar Children's Inline Skates are semi-soft and size-adjustable. These rollerblades have a push button adjustment system, making them quick and easy for kids to use. These skates are perfect for kids wanting to travel at lightspeed. Available in 3 great colours! Wheel Sizes: 70 x 22mm PU Cast for Medium 72 x 22mm PU Cast for Large Sizes: S: J8 - J11 M: J12 – 2 L: 3 – 6