High Quality ABEC-3 bearings for T-REX 450X, XL, SE, HDX 450SE and other 450 class helicopters. Replace stock bearings by these high quality ABEC-3 bearings with much higher tolerance and smoothness and feel a much difference in response. Specifications: ?Bearing 693ZZ  (3x8x4mm) Quantity: 4 pieces Use in T-REX 450 X, XL, SE helicopters

If it doesn't specify which ABEC rating, it's likely that's it's ABEC-1.  ABEC-3 bearings are much tighter in tolerance than ABEC-1 bearings, thus provide much higher accuracy and smoothness.

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