The 33-129-41 fork seal set is an aftermarket fork oil seal / dust seal kit designed to service the fork legs. The kit likely includes:
Oil seals (rubber / elastomeric) with dual sealing lips, to prevent oil leaking out while keeping dirt & contaminants from entering.
Dust / wiper seals to protect the inner fork tubes and the oil seals from abrasive particles
Design features like directional ribs on the outer surface of the seal for easier installation, and better grip during mounting.
Typically used in fork legs with inner diameter 49 mm, outer contact diameter 60 mm, and thickness 10 mm (as per your stated spec)
This kind of kit is essential when rebuilding or maintaining front suspension — worn seals lead to oil leaks, loss of damping, dirty fork internals, and accelerated wear on fork tubes.
