These bearings come with just machine oil on them to prevent rust. You MUST pack them with grease (we recommend white lithium grease) to pack them. We also have 2 printable bearing packing tools to help pack the grease in the bearings.
Printable Bearing Packing Tool Links:
Failure to pack the bearings with grease will result in damage to the bearings and our warranty will not cover if you damage these because they are not properly installed/used.