The Kastaplast Rask is a "faster disc." This very overstable driver has a unique inner ridge on the bottom flight plate that is designed to reduce drag. This bump is located a fingers width away from the inner rim.
Disc image and description via Infinite Discs.
- Diameter: 21.2 cm
- Height: 1.6 cm
- Rim Depth: 1.1 cm
- Rim Width: 2.2 cm