Ball Bearing Set, Complete, fits Tetra18 X1, X1T, X2, X2T, K1 (19pcs)
Includes:
4x8x3mm 4pcs
2x5x2.5mm 5pcs
5x8x2.5mm 4pcs (with 5x8x0.5mm washers 4pcs)
3x6x2.5mm 6pcs