Gotoh's GB707 Bass machineheads 4 in line, sold as a set of 4. Held on with one screw per tuner, the bushes, washers and screws are all included. 20:1 gear ratio. Using Gotoh's Lubri Coat technology - keeping the lubrication on the internal gearing for the life of the tuning machine heads. Now enhanced with Gotoh's original anti-transformable lubrication oil that reduces friction between the gears resulting an ultra smooth feel, minimal back lash and unrivalled tuning stability. Featuring rock solid posts - next time you change your strings, before you put on your new set, take a look at your stock tuning machine head posts. See how they move from rock side to side This has been a problem with tuning machine heads since they were invented. Not with Gotoh tuners that use rock solid post technology to create the most stable tuning post on the market.