Mathews Top Hat kit allows you to micro adjust your cam position for fine tuning your bow. 
Have a look at this video by Mathews Pro Braden Gellenthien on the process

Works on Halon series, TRX Series, Traverse, TX-5, Triax, VXR, V3, Atlas, Image, V3X, Phase4, Lift and Title bows

Comes with 12 total pieces