This sealings both the oil and dust sealings are meade a better way than other sealings! The oil sealing are equipped with 2 springs one on the inside as normal but also one on the outside that will keep small particels out of the system Beautiful!!! And the dust sealing are equipped with one spring like the oil sealing on the outside!!! This will really extend the lifespan on this sealings. This design is a BIG imrovement over the other sealings on the market. This sealings will last much longer than any other sealings. I do absolutely recomend the All Balls sealings to everyone that want something better than the regular sealings!