Sorry what do you mean?
The famous 'hockey stick' curve - rise in CO2/temperature levels and climate change
or the material that a hockey stick is made from?
Coefficient of restitution of the stick is higher for composites. They also tend to be stiffer. you are unlikely to find any exact compositions or manufacturing data for real sticks as companies keep that to themselves.
Also just to clarify are you taling about field or ice hockey?.