Just a washer, but a washer nonetheless... Please take this opportunity to hear the difference for yourself. Thank you for viewing. This is an original bolt/rod washer, brand new, unused, and comes in a set of 20, made in Japan. It's cast without burrs, with chamfered inner and outer edges, a glossy finish on one side, and a hairline finish on the other, allowing you to choose the anti-loosening effect depending on the direction you install it. You can use it on snare drums, as well as toms and bass drums. Typical feedback from users who have purchased these include: ① Improved clarity and sharpness, enhancing the sound quality. ② Overtones became pleasant, and the snare drum itself resonated better. ③ Added beautiful high frequencies, transforming the sound into something usable. ④ The washer itself has a high density and mass, which seems to have a positive impact on the sound. ⑤ The sound of open & closed rimshots is satisfying. ⑥ Due to the material's properties, the tension bolts are less likely to loosen even with hard hits. ⑦ Compared to brass washers released by multiple manufacturers in the past, the build quality is the best. ⑧ It's compatible with Sonor's minus-head bolts/rods, making it very useful. Brass has excellent acoustic properties and is used in guitars and basses for sustain blocks, saddles, bridge bodies, tuning pegs, nuts, etc. Looking at drums, one of the reasons why vintage instruments like 60s Supra-Phonics and old Radio Kings are favored is the imagined influence on the sound due to the use of brass hoops and washers. If you are dissatisfied with your drum sound, this is a more affordable way than replacing the hoops, and you can definitely feel the change. Please note that we are unable to offer discounts due to rising prices and increased raw material costs. Thank you for your understanding.