There are 16 pieces on offer. Titanium valve spring retainers for all C20LET / C20XE engines! By using a high-strength titanium alloy, which is primarily used in aviation, we were able to lighten the weight by 40% compared to the series. Another advantage that results from the above-mentioned reason compared to aluminum and the normal steel plates is that they are safe to run in even with valve springs with a higher spring rate. These plates are perfect when the speed is increased significantly. Suitable double spring kit: Supertech SprK-T1012-C20 Series: 15.6 grams/pcs. Titanium: 9.6 grams/pc. (0.1 gram tolerance) Scope of delivery: 16 pieces. Valve spring retainer