I thought they were a little cheaper than they are however I was very pleased and surprised by the quality and durability which should be pretty close as flexibility is somewhat limited by one small amount of anti-seize tools on the axle, they slide fairly easily (no bumps) as others have said, but you need to loosen the set screws very loosely and know a bit about what you're doing and how to use them in the first place. Overall I am satisfied and would buy them again if needed.