Let the Lumenok XP help you tune your equipment and your shooting skills. The Lumenok XP is made to fit small .205" diameter carbon arrows, and battery retention components allow the battery to be changed easily for the brightest operation possible. With the Lumenok XG in your arrows you will never fail to see shot placement. Part of the proceeds from the sales of the pink Lumenoks will be donated to Breast cancer research on behalf of the Mary Hale " Pink Arrow Project"