1 x BBB / BHP-183 sealed headset bearing

 (Also know as TH970E P17 MR168  970e-rs)

This is not BBB branded, but an alternative matching bearing

Inner x Outer x Depth (mm):  34x46.8x7 
Inch Dia: 1-1/8”
Angle / Chamfer (Deg): 45 / 45
Material: Bearing Steel
Grease: Mobil XHP-222 or SINOPEC HTHS Bearing Grease
Seal: Double-sealed 2RS
Material: Chrome Steel 100Cr6 (Race & Balls)
Cage Material: Nylon PA66