Rocking skateboard: With 2 PU wheels and steel-tube torsion bar connector Easy to use, just rock your body on it ... quick Rocking skateboard: With 2 PU wheels and steel-tube torsion bar connector Easy to use, just rock your body on it ... and quickly skate forward2-wheel, steel tube torsion bar connector, rocking skateboard1)board material: PC+ABS2)wheel material:PU3 ...