Bearings are sold individually and not in pairs. Best all-steel bearing for wheel hubs. Note that this wheel bearing has a grey "LLU" outer seal that is a medium contact double-lip seal to help keep contaminants out. The black inner seal (faces toward the inside of your hub) is an "LLB" light contact double-lip seal. The "CN" interenal clearance rating is tighter than the "C3" clearance spec and better for hub sockets that are a light press fit.

"61903 ABEC 5 dual seal bearing. Best all steel bearing for wheel hubs.

DIMENSIONS ....... 17mm x 30mm x 7mm
INTERNAL CLEARANCE RATING: CN (best spec for light press fit bearing bores)
SEALS ...... "Snap Ring Seal" or "LLB"
BALL MATERIAL .....Chromium Steel
BALL GRADE ............... 5
RACES ........ Chromium Steel
APPLICATION .... Wheel Hub
GREASE ... Realube Bearing Compound