Set of 16 titanium retainers that are a direct replacement for the original steel retainers all 4 valve air cooled Suzukis:
GS1100
GS1150
GSX1100 Katana (1981 onwards)
GS 750
 
Made of best grade titanium - Grade 5.

The original retainers weight 9,5g and the titanium retainers weight 5,3g, 45% lighter.

These retainers have a smaller profile/height (less 0,5mm) to allow for more valve lift without contact with 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.