X fan 50 x 50 x 10mm dc axial fans 12v ballsleeve bearing x fan rdm5010b1 rdm5010b1 is a high quality ball bearing 12v dc axial fan from x fan which has been manufactured to a high standard both lightweight and small this brushless cooling fan has passed through stringent quality control testing and has the following safety approvals x fan rdm5010b1 50 x 50 x 10mm axial fan 12v ball bearing