The JK (Juliana Korver) Aviar-x is made from the disc golf driver mold in a special blend of durable Pro-line Plastic that is more flexible and grippier than the other Aviar-x models. It has the same flight characteristics as the KC Pro Aviar. Its softer plastic is better in colder climates and for those who have dry hands and require a tackier grip. We recommend this disc to the player likes softer putters with beads. Great wind putter.