The Chronic's bases (and all of Line's skis this year for that matter) are either black with white graphics or white with black graphics. The reason is to save base material so half of them are black and half of them are white. Same reason why the Afterbangs are either green, blue, or white (cause all three of those colors are featured on all the bases) and the Anthems are either pink or blue. As far as which you get, if you buy them at a shop you can pick them out, if you order them online, it's luck of the draw.