TRF X-Ring / O-Rings 70 or 50 Durameter (8 pack) [Tamiya] 42214 422145
These Damper X-rings have X-shaped cross-sections and offer increased oil sealing effect compared to standard O-rings with circular cross-sections. Made from special silicone material, these X-rings also maintain their shape, and therefore their sealing ability, for a longer period of time.
50 DURAMETER is designed for use with silicone damper oil while 70 DURAMETER is for mineral based damper oil. (Advised from Tamiya)