World Champion ACER Racing 5x13x4mm Ceramic Ball Bearing.  This is a 5x13mm ceramic ball bearing also known as a 695 bearing or size 5x13x4mm ball bearing. Diamond polished Silicon Nitride (Si3N4) Balls, HSR cage technology and sealed on both sides to keep out harmful dirt and keep you revving higher.  Lubricated with 100% synthetic ACER Racing ACERGoo which will keep the clutch bearing cool under stress and also result in super fast and super smooth bearing action.

If you are looking for a 5x16x5mm ceramic bearing it is eBay item 251055125484