Cartridge headset bearings: ACB for high-end bicycle headset bearings MH-P03 (30.15x41x6.5 mm, 45 °/45 °),

Bearing steel GCr15

Material: inside and outside the ring and ball,

Nylon retainer, internal add Mobil XHP-222 grease. (Available with Dahon Dahon BYA412 folding bike