These wire ferrules are an excellent way to dress up your amplifiers install. These are for amps where fork terminals will not fit properly. 

I sell these individually. These green ferrules are 10-14g.
 
They fit the following wire that I sell:
Raptor 14awg
Tspec 12awg
Install Bay 10awg

I buy in bulk for my own installs so I can offer these to you cheaper than anywhere else. Feel safe using the same parts that I do, a veteran installer of over 15 years.