To add more info for the Slick Tricks for Silver Fox:

1) The way the blades lock together is as solid as it gets.
2) The blades are thick and as tough as nails.
3) They truly fly like field points even from speed bows. My son's is 299 fps.

There are alot of good heads out there and Muzzy is one of them. I shot Thunderheads before this and swore by them. But these are just my favorite based on the reasons above.