This is a set of two full ceramic bearings. Size: 4x10x4mm, MR104 These bearings are likely compatible with Ambassadeur Ultra Cast 4500c, 4600c, 5500c, 5600c, 6500c, 6600c, etc. Please confirm the bearing size used in your reel as I may not be aware of all models. Please refrain from price negotiations. A discount of 200 yen will be applied from the second set for multiple purchases. Please comment if you wish to purchase multiple sets. Returning customers will receive a discount, so please comment. Compatible models: 5501c, 6500cs, 4601c