Coming from Bezerk is a set of carbon fibre pucks that help to easily convert a regular 1/12th pan car diff into a spool axle in no time. The carbon fibre pucks will replace standard diff balls for shorty cylinders in order to create a locked spool axle as it is a popular setup option when running in high bite track conditions. The set includes ten pucks with 16-ball spur gears using eight and a twelve-ball main gear taking six pucks. After inserting the pucks, the diff will be built as normal – sans balls and diff lube – with the friction created by the carbon pucks hindering the gear from slipping on the axle. In addition the pucks are also very light of weight with ten pieces weighing in at 0.32g.