Velocity Archery The Beast Broadhead, Red/Silver, 2"

I just received the Velocity Archery Beast 4 Blade Razor Hunting Broadhead, Red/Silver! I haven't shot these yet, but I like the 4 blade design and the ease of use! I was looking for a rear deploy blade broadhead and the description doesn't say they use rubber bands but they do! Also, i didn't see anything about where to get replacement blades OR rubber bands! I will try them and rest assure, I WILL decide if I purchase more and I hope they work good! 2018 update: I used these to take two deer when I originally bought them! The blades didn’t open up on contact but the exit hole was massive! I shot them from a crossbow at 260fps, and I didn’t use them last year! I have two left from the three I bought and I may try them this year!