Contents
  1. Overview
  2. Flight characteristics
  3. Recommended uses
  4. Plastics & variants
  5. History
  6. Notable throwers
  7. Similar discs

The Kastaplast Berg X is a 1-speed overstable putt & approach. With published flight numbers of 1 / 1 / 1 / 2, it is most often described as suited for short approach shots that must stop dead without skipping past, forehand approaches where torque resistance matters.

Overview

The Kastaplast Berg X is an overstable putt-and-approach disc rated 1 | 1 | 1 | 2 by Kastaplast.[1] It keeps the original Berg's defining traits — the deep, ergonomic thumbtrack on the flight plate, the very low glide, and the drop-and-stop landing — but adds torque resistance. Kastaplast's own copy puts it plainly: the feel and flight are familiar 'until you expose the Berg X for more power. Give it all you got, it doesn't matter, the line will remain the same.'[1] The company adds that the increased stability 'makes it perfect for the forehand approach.'[1] PDGA measurements give it a 21.1 cm diameter and a 0.9 cm rim.[2]

Flight characteristics

Flight numbers: manufacturer vs. community
SourceSpeedGlide TurnFade
Kastaplast (mfg) 1 1 1 2 Published spec
Discpedia community Loading ratings…

Flight numbers describe the published behavior of the disc when thrown at its design speed. Real-world flight varies with plastic, weight, age, and thrower power. The community-averaged numbers above reflect crowd-sourced observations from real throws — typically slightly more understable than the manufacturer's published values, which is the most consistent pattern across nearly every commercial mold.

The Berg X is a placement tool, not a distance disc. Its near-total lack of glide means it lands where it is aimed rather than sailing past the basket,[1] which makes it well suited to short approaches, wind-fighting upshots, and tee shots on very short holes. The extra torque resistance relative to the Berg is what Kastaplast highlights for forehand approaches.[1] Kastaplast offers it in K1, K1 Soft, K1 Hard, K1 Glow, K1 Grind, and K3.[1] K1 Soft is the grippier putting-feel option; K1 Hard and K1 Grind are the stiffer, more durable choices for approach work.

Best for:

  • Short approach shots that must stop dead without skipping past
  • Forehand approaches where torque resistance matters
  • Headwind and crosswind upshots inside 200 ft
  • Aggressive tee shots on very short, tight holes
  • Spike-hyzer placement over obstacles

Plastics & variants

The Berg X is available in the following plastic blends from Kastaplast:[1]

K1, K1 Soft, K1 Hard, K1 Glow, K1 Grind, K3

Plastic blend significantly affects flight character. Premium plastics like Champion, Z, or C-Line generally fly more overstable when fresh and hold their stability over time. Base plastics like DX, Pro, or Active beat in faster and become more understable workhorses with use.

History

The Berg X was PDGA-approved on May 22, 2023 under certification number 23-148.[2] Its origin predates that approval by nearly a decade. In a March 11, 2025 article marking the original Berg's tenth anniversary, Kastaplast founder Jonas Lindberg — who created the original Berg mold — recounts that the first factory-made Berg prototypes 'were shockingly overstable and faded harder than any other putt- and approach disc,' which he describes as 'a big failure' at the time. He then writes that 'much later, the mold called Berg X was created from one of the later variants in this process, because many of them weren't bad at all, just not what we wanted for Berg.'[3] The Berg X is therefore a rescued prototype rather than a ground-up new design. Kastaplast has since issued player editions on the mold, including a K1 Berg X for Casey Lee and a K1 Hard Berg X Tour Series for Braeden Sides in 2026.[1]

Notable throwers

Casey Lee, Braeden Sides

Similar discs

References & further reading

Sources

Content on this page has been cross-checked against the following sources. Numbered citations in the prose above link to the matching entry here.

  1. Berg X — Kastaplast (official collection page: flight numbers, plastics, product copy, player editions)
  2. Berg X — PDGA Equipment Certification (approved 2023-05-22, cert 23-148, dimensions)
  3. "10 Years of Berg" by Jonas Lindberg — Kastaplast news (Berg X mold origin, 2025-03-11)
  4. Kastaplast Berg X — Infinite Discs product page (plastics, retailer specifications)

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