One thing I did notice was that the grip felt a little small in my hands and after closer scrutiny I see that the butt diameter is .595 verses what I’m used to is .600 so for some one with normal size hands I would recommend adding an extra layer of grip tape, or if you have a player who has smaller hands or women they will enjoy the smaller feel with a single layer of grip tape.

Matrix says;

Each Matrix Studio shaft is tested for Circum-Flex Integrity [CFI], a measure of uniform flex, no matter the shaft alignment. Then through Matrix Multi-Matching process, each shaft is tested for proper tip-to-butt section proportionality. No other manufacturer employs this process. The Matrix Multi-Matching and CFI produce the most repeatable, accurate performance in a golf shaft today.

SIMPAC 64
Graphite Woods	Length (in.)	Tip	Butt	Par. Tip (in.)	Flex	Weight (g)	Build Range	Quantity
L	46	0.335	0.595	3.5	L	60	1.7-3.0	100
A	46	0.335	0.595	4	A	61	2.3-3.8	250
R	46	0.335	0.595	4.25	R	62	3.0-4.5	50