RipTide Reactor Series Cushions Step Cone/Barrel Krank 84a Hard - Orange (8 Pack)Premium Urethane Cushions for Reactor Plates. Sold as a custom 8 Pack with optional washers. Reactor series is required to have a cup barrel washers in the Plateside position since the stock washers are not compatible with our bushings. We do not carry WFB for the Reactor Series. If you were interested in WFB and now aren't sure what to get, please contact us for a custom recommendation! Antik AR2 Derby PowerDyne Reactor Pro 0. 50" Step Cone 0. 55"