"The hookbaits come in four colours - Pink, White, Yellow and Red, all selected by Rob himself. Each colour is designed to suit various lake/river bed conditions from clay and silt to gravel and weed. The colour wheel is designed to help you select the right colour pop-up according to the lake bed where you are fishing. Each pot is labelled with the ideal conditions for its use, e.g gravel or weedy swims. White: 12mm, 15mm = Deep water & silt