However, they are more difficult to maneuver due to their lack of flexibility. Beginners should start with a board that is slightly flexible yet still has some bite to it. This will help them learn how to turn safely while keeping control of their board. As they gain experience, they can progress to a more flexible board that allows for faster riding styles. There are two types of flex ratings used by snowboard manufacturers. One rating is called "stiffness" and the other is called "grip." Both numbers refer to tests done by Snowboard Performance Labs on full-size prototypes of potential new models. The higher the number, the more flexing the board will do before it breaks under pressure from turning or jumping. A board rated 80 or greater on the stiffness scale is suitable for beginners who want to retain some style when hitting big jumps or spinning down hills. These boards tend to be more durable as well; the flexing action helps smooth out any rough edges on the surface of the board.