【Get the same effect as Speed Master bearings at about 1/3 the cost!】 SONOR's Perfect Balance drum pedal, despite being a high-end model, has the drawback of significant friction loss because the spring roller is just a simple metal ring. (Although the hinge has been equipped with bearings in a model change, the spring roller remains untouched.) Therefore, many people seem to be installing Canopus Speed Master bearings (formerly Speed Star bearings), but it's a bit disappointing that you can't use the function of attaching the unique design of the spring hook to a magnet. So, I created these grooved bearings. They have a simple shape, just the outer ring of an NSK stainless steel bearing with a groove cut into it (*), so the spring hook can be used as before, and the movement is more agile because it doesn't have a heavy bearing holder like the Speed Master bearing. ★↓Here's a comparison video before and after replacing the bearings. https://youtu.be/05tY-_7_nwE ★↓Here's a video showing that our bearings have the same low friction as Speed Master bearings. https://youtu.be/i2p9vLpm7tg ●This is a set of bearings and the bolts and washers (large and small) needed for installation. It can be installed on both the new and old models of 'Signature' and 'Standard'. (*) Although the outer ring of the bearing has been cut, the strength required for the spring roller is ensured. Also, the groove is only about 0.3mm deep, but the spring hook will not come off during performance. speedstar bearing speedmastar bearing