STAN'S NOTUBES - E-SYNC FREEHUBS AND FREEHUB PARTS
E-Sync drivers include pawls, springs, pawl retainer, 0.5mm freehub spacer, 1.8mm cassette spacer, and freehub seal. The Micro Spline kit also includes the drive side endcap.
Also compatible with Neo and Neo Ultimate hubs as a more durable upgrade.