The all new Extended Ra Pearl Reactive Cover is incredible! It increases the Ra value, allowing the LevRG RESPONSE to deliver the most responsive and continuous ball reaction the industry has ever seen! The development concept was to produce a new coverstock with a larger Ra value in order to increase performance by providing increased lane surface contact. Use modified core densities to produce a later more responsive and continuous breakpoint. All new coverstock formula designed to raise the Ra value of the cover thus providing improved contact between the ball and the lane surface. Although the Extended RA Pearl Reactive coverstock provides increased surface contact, the cover material is extremely "workable" and accepts sanding and polishing easily, allowing for breakpoint locations to occur sooner or later down the lane, depending upon the surface adjustments made to the cover. Core Notes: Density adjustments within the EZ Rev body, hood, and lower cap have made it possible for us to increase the RG value while reducing the asymmetrical and total differentials. This change helps to generate a more powerful rev rate down the lane, allowing for stronger changes of directions on the backend with increased continuation. Please note that due to color swirls during manufacturing, actual swirl patterns and concentrations may differ from this sample.