The F4 Alpha is a performance fin made in the USA. They are designed for smaller sized riders, and made with an exclusive composite that is carbon and air infused and lighter than Honeycomb. They fall into the Balanced category on the Ride Number scale making them a great all around choice, because they provide enough spring to make it around sections while still maintaining some predictability and hold.
Alpha fins are made with a special composite designed with the help of 3M. It's carbon and air infused, and it's super lightweight.