Where to use this rare stone?

[Fatg]

携帯端末情報(必須)/Mobile Device Information(Required)*

Samsung A55

アプリのバージョン(必須)/App Version(Required)*

V115.0

問題の詳細/Issue Details

I redeemed 4 pcs of it but can’t find it in my bag

Also where can I use it?

画像、動画ファイル添付(最大30MB)/Attach screen shots, video files(Max30MB)

[NianticModKIC]

@Fatg
This material is used to enhance style weapons.
If the material is missing, please contact us via the in-app support.