There is (or certainly was) a gp4000 tub, I had them on my Heds and they felt very nice, and lasted a long time, but I believe they are u repairable, so one use only type things....
@Sainsburys_Ed started
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There is (or certainly was) a gp4000 tub, I had them on my Heds and they felt very nice, and lasted a long time, but I believe they are u repairable, so one use only type things....