Do you know pen spinning ?
That's street sport hand. the equipment you must get to play it is the "MOD"
If you wanna do any mod, you must choose raw material.
You can create for new pen mod, but with two conditions :
+ Two side must weight similar
+ It must be suitable for your hand to be easy for spinning
All right, if have have the mod, with patience, you can impress everyone who see you spin the mod :)