ProX Dust Cap Set RM-Z450 15-17 + CRF250R 15-23  - SHOWA
Front Fork, Oil Seal and Dust Seal Features: 
Manufactured by the leading OEM factories in Japan such as NOK.
High quality base materials made to OEM specifications and tolerances for guaranteed quality and superior durability.
Available separately or in sets to be a simple and cost efficient OEM replacement.