CXD MR 15307 LLB - XD15 Ceramic - Hybrid, ABEC-5, Radial Bearing (C3 Clearance) - 15mm x 30mm x 7mm The ultimate upgrade An Enduro Bearings exclusive, our XD15 Ceramic - Hybrid bearings combine corrosion - proof, cryogenically treated nitrogen steel races with Silicon Nitride Grade 3 ceramic balls in a proprietary process that results in the ultimate high performance bearing setup. The Deep - groove raceways design allow for maximum sized Grade 3 Silicon Nitride ceramic balls for for increased contact area and improved performance and longevity. Dual - lip labyrinth (LLB) seals protect from the elements, and contain the 90% fill Kluber NBU52 grease that runs smoother with time and is highly resistant to being washed out. The most impressive feature of XD15 ceramic - hybrid bearings is, unlike other bearings, they only get better with time and use. As the bearings wear - in, the super - hard ceramic balls actually make the XD15 races even smoother. Also, when compared to other ceramic -...