ION - GAUI X7 / NX7 Precision (ABEC-5) RED Sealed Tail Case Radial bearing SET (2 pcs)
Features:
Includes: (2x) High precision ABEC-5, low friction deep groove ball bearings
If a Retailer/Vendor does not specify which ABEC rating, it's likely that's it's ABEC-1, or even lower! Most helicopter kits come standard with ABEC-1 steel bearings. ABEC-5 bearings are much tighter in tolerance, thus providing much higher accuracy/smoothness, better efficiency, and longer life.
NOTE: The example chart below shows the tolerance difference between ABEC-1, ABEC-3, and ABEC-5 bearings.