Thank you for viewing! This is an original bolt and rod washer set, new and unused, 20 pieces per set x 5. These washers are cast without burrs, with chamfered inner and outer edges. One side has a glossy finish, and the other has a hairline finish, allowing you to choose the direction of installation to control the loosening prevention effect. They can be used on snare drums, as well as toms and bass drums. Representative opinions from users who have purchased these before include: ① Improved sound quality with better clarity and crispness. ② Pleasant overtones, making the snare drum itself resonate more. ③ Added beautiful high frequencies, resulting in a more usable sound. ④ The high density and mass of the washers themselves have a positive impact on the sound. ⑤ The sound of open and closed rimshots is satisfying. ⑥ Due to the material's properties, the tension bolts are less likely to loosen even with hard hits. ⑦ The best quality compared to brass washers previously released by multiple manufacturers. ⑧ Compatible with Sonor's minus-head bolts and rods, which is appreciated. 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 Super Ludwigs and old Radio Kings are favored is the 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 to achieve a noticeable change than replacing the hoops. Please note that we are unable to offer discounts due to rising prices and increased raw material costs. Thank you for your understanding.