Unique to PowerDyne Universal Magic Cushions is the Power Assist™ formula for total performance.

Made from high-quality urethane, Universal Magic Cushions (also referred to as "bushings") retain energy and release it when you need it most. Just like shock absorbers on a car, Universal Magic Cushions soak up the imperfections of the surface, keep you connected to the road ahead through enhanced feedback, load up when pressed to the limit, and then release your stored power in a forceful yet predictable manner.

the lower the number the softer the cushion is.

Red =Soft

Orange= Medium

Yellow = Hard

lighter people tend to go for soft and heavier people go for hard, Its not a rule just a guide, in the end its all down to personal choice, 

If you are new to skating, changing up your cushions can help a lot with control and cornering!