The JK (Juliana Korver) Aviar is made from the driver mold in a special blend of durable Pro-line Plastic that is more flexible and grippier than the other Aviar models.
The Proline KC Aviar (classic mold) is the original model that gave rise to all other Aviars.
The Beast issued in the era of the wide rimmed driver. The Beast was an instant classic when it was released; giving players more distance using less power.