The incredible Cobra creates two types of roll simultaneously (at the same time) i.e. Forward Roll and Side Spin. The Cobra is so dynamic it is virtually impossible to full roll a bowling ball while using this wrist support. Designed for the better bowler in mind, I do not recommend that below average bowlers try it unless they are very serious about their game and are prepared to get their socks knocked off. Recommended for slick lane conditions, average & above average bowlers.