The Kastaplast K1 Berg refuses to glide, and that is the entire point. Throw a 40 foot approach with this disc and it drops almost straight down instead of skipping past the basket. K1 is Kastaplast's flagship plastic, firm and dependable from the first throw.

Flight Numbers: 1 / 1 / 0 / 2

K1 plastic is a little slick when brand new and breaks in over a few rounds to a grip most people end up liking a lot. It is very durable, holding its shape and stability for years, and the thumbtrack, a groove in the top of the flight plate where your thumb sits, stays crisp for a long time in this plastic.

Thrown at approach speed it flies flat and short before fading and dropping, without skipping past the target. Rip it off the tee with no extra torque and it holds a straight line with only a small fade at the finish, which is unusual for a disc this overstable in shape. Wind barely moves it, making it the disc to reach for on gusty days when a putt needs to just get there.

Built for approach shots, layups on downhill holes, and rollers, since the low glide and firm rim make thumbers and rollers surprisingly reliable. It is not the best choice for players who want a lot of glide inside the circle.

Want a softer feel for putting? The K3 Berg is the tackier version of the same mold. Prefer glow plastic for night rounds? Try the K1 Glow Berg. See the whole overstable putters selection.

Speed 1, glide 1, turn 0, fade 2. Diameter 21.1 cm, rim width 0.9 cm, max weight 175 g.