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These work perfect for my squier Jazz Bass. I've got the cv70 and I've replaced the machine heads with Guyker machine heads as they are the closest in physical size to the original hardware. The machine heads come with an extremely small washer which barely covers the remaining hole after the machine head has been attached through the head of your bass. Many people have complained about this but I took a different route and purchased these grommets and then reamed out the hole on the inside so that they could be used for said machine heads. Using an aluminum dowel wrapped with 150 grit sandpaper I was able to bore the hole larger by over a millimeter which was enough for them to work perfectly! Once the fit was achieved they installed no differently than a factory set of Fender machine heads. The material that these grommets are made out of was non-magnetic. Seemed like aluminum alloy of some sort.