LUNA Mod is a very nice heavy pen spinning mod. Suitable for power style, but as well it is really good for practicing smoothness of your moves. Such combination is pretty rare and always is a competitive advantage of a pen mod.
It also has inversed tips from both sides, which is awesome, because you have much less chance to damage surface you spin upon, when you drop a pen for pen spinning. Soft and nice to touch grips and a great colorful spin effect will make you fall in love with LUNA.