Are your Cobra pedals designed to be fitted with the Cobra Coils? If they are, the Coils cost about $18 USD per coil. If your pedals don't have the slot at the bottom of the footboard, your going to need new pedals and the newer generation will already have the Cobra Coils installed. The coils will give you a bit more flexibility being able to set the tension of the beater and the foot board rebound sort of independently. I have a pair of Iron Cobra double pedals without the coils and also a single IC with the coils. I have the coils on mine set rather soft, but they're adjustable from very little attack to heavier attack, depending on what you need.
Dennis
Yeh there only like 8 months old, and cheers for the advice!