101Leafy researched the games.
Bi-Colored Castanet

One blow causes the claw to hit against the shell, making a unique sound.
| Class | Hunting Horn |
|---|---|
| Rarity | 10 |
| Attack | 1404 |
| Water | 260 |
| Defense | +20 |
| Slots | 0 |
| Price | 115,000z |
Upgrades
| Upgraded from | Shell Castanet+ |
|---|
Upgrade tree from モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 740.