Our hand wound pickups have Alnico V magnets and North Up Magnetization. The lead wires are retro styled. Pickups shell made of vulcanized fiber and has a 6-32 thread for mounting on the bridge. Pickups potting fulfilled with paraffin and beeswax. DCR tolerance +/- 10%. All pickups have standard size. Can be used with any Stratocaster guitar. Screws and tubes springs are in the set.