Set of 8 Titanium Retainers made of best grade titanium (grade 5)
These are a direct replacement for the original steel retainers on the:
Yamaha TMAX500 (until 2012)
 
The original steel retainers weight 5.9g and the titanium retainers weight 3,7g
 
These retainers have a smaller profile/height (0,7mm shorter) to allow for more valve lift without contact with the oil seal and without requiring valve guide modifications.
 
Using lightweight titanium retainers allows for more aggressive camshaft profiles (lift and duration) without losing control of the valve and increased rpm limits - a must for any performance / race engine.