This bearing is a game-changer in the world of high-speed industrial machinery .With a shielding design that increases durability and a clearance of 40000Rpm, it delivers optimal performance and longevity. The only downside is that it may be a bit too specialized for some users, but for those who require a high-quality bearing for their machines, the NSK Shielded Clearance 40000Rpm Rotational is definitely worth considering. Overall a fantastic choice for any Industrial and Scientific application..