This is the "Shorty" version of the innovative and highly popular SubZero Competition mod. The shorty subzero competition mod comes with the short switch and silver plated contacts pre installed. 
The Shorty version comes in copper and features the Subzero Short Switch instead of the stock switch, and comes with silver-plated contacts installed out of the box. Note: the short switch eliminates the locking feature of the mod. It does make the subzero competition mod smaller, hence the shorty name and ready for battle at your next cloud competition. 
The shorty SubZero competition mod features the same patent pending 8 point clutch contact system that allows maximum conductivity and efficiency while maintaining low operating temperatures. The Clutch Contact is a 4 piece, floating contact reduces voltage drop and increases efficiency and consistency. No need to find the sweet spot of the mod with this button. Every time, no matter what way you push the button, you will get a consistent button fire every time.