The Serpent Cobra is already fitted with the famous and supersmooth 16mm Serpent shocks.
To make the shocks even better, or adapt to other conditions the following optionals can be tried:
New type membranes, with webbed profile for more consistency, also under high pressure / temperatures.
http://www.serpent.com/product/600357
Another good option for durability and smoothness are the titanium coated shockrods.
600306 and 600307
http://www.serpent.com/product/600307
The tappered type shock pistons are also an interesting option to try for the tech addicts.
http://www.serpent.com/product/600349
There is also a wide selection of shock springs availabe to suit the tracks your are racing best.
http://www.serpent.com/product/600257
As last other option you may try to fit your shocks with these ligh-weight but very durable alumnium shock-spring cups.
http://www.serpent.com/product/600287
Like always with options, its not necessary to fit any of them, but its really nice to try out new stuff and improve performance further step by step, alongside experience and level of racing.
Enjoy !
Team Serpent