The Ultimate spring range was developed by Eric Grauffel and his team to improve your shooting sensation. These springs are ideal for shooting in competition, they will guarantee lightness and performance.
This spring is compatible with all the CZ 75 type of pistols. (CZ75, CZ97, CZ P-09, CZ SHADOW 2, CZ75 SP-01, CZ75 TS including Czechmate and TS 2.)
Whether in Double Action or Single Action, the Hammer Spring Ultimate optimizes starting weights according to the needs and ammunition used.
The tests are carried out on a Shadow 2 factory weapon. On 10 weighings, the highest and the lowest are removed. The average is carried out on the eight remaining weighings.
Here is what we found:

Factory Spring : 32 Coils 
8 Lbs : 29 Coils
10 Lbs : 29 Coils 
12 Lbs : 28 Coils 
13 Lbs : 29 Coils 

On the picture , the spring (below) have 10 000 Shots

Do not forget that the springs are part of the wearing parts of your weapon! Any modification to your weapon will void its warranty. Any change of part on your weapon must be carried out by a qualified gunsmith. SARL Eric Grauffel declines all responsibility concerning a misinstallation.