HORIZON HELIS BLADE 130X BEARINGS HORIZON HELIS BLADE 130X Econo Power RC Helicopter Bearings Kit Components: QTY.4:MR52-ZZ/W2C, QTY.2:MR681X-ZZC, QTY.2:MR74(X), QTY.2:MR681X #1 AF2, QTY.2:MF681X-ZZC