These are APOGEE timpani mallets. They are 301F, 355mm. I used them with care, so I believe they are in good condition. Quoted from the manufacturer's website below: 〜〜〜 These mallets add to the APOGEE sound with a variety of overtones suitable for orchestration. The timpani sound asserts itself while smoothly blending into the resonance, giving the player a sense of fulfillment. Tai Shimizu These are wonderful mallets with a brilliant attack and rich overtones. I was looking for mallets with this kind of sound myself. Takuro Shiota 〜〜〜