If it is a Nev-R-Lube, it's a product of Dexter Axle
Below is what Dexter states of the Nev-R-Lube.
-No need to pull the hubs to repack the bearings OR replace the seals when checking the brakes.
-Pre-set adjustment means installation is easy and human error is virtually eliminated in bearing adjustment.
-Pre-lubricated at the bearing factory providing resistance to contamination.
-Sealed for life which means increased durability and reliability with less bearing maintenance.
-5 year or 100,000 mile warranty against defects in material and workmanship.