AA,A ,B class,many sizes available. It can be operated in various pictures as you like. 1. Flat Backs Hotfix2. Size: SS4, SS6, SS10, SS12, SS16, SS20 & SS30sizediamonentgrossss41.5mm1000Gss62mm1000Gss82.5mm800Gss103mm500Dss123.5mm400Gss164mm200Gss205mm100Gss306mm50Gss347mm20Gss408mm15G. Available rhinestone: Crystal, Crystal AB, iron-on stud, aniseed panel pressing,rhinestones, rhinestud, octagon ...