Prometheus Design Werx

ULTEM Signal Whistle

$ 33.00
Overview
Superbly machined from solid ULTEM® billet rod, our SPD ULTEM® Signal Whistle is designed to be used to alert others with a high pitch and piercing sound rated to 120+ decibels. Whether in a search and rescue capacity or to alert others in your party when separated in the backcountry, this excellently made EDC tool can be worn around the neck with the included stainless steel MILSPEC ball chain or clipped to a keyring as desired. #ultemsignalwhistle


Wilderness
EDC

The SPD ULTEM® Signal Whistle is an ideal piece to incorporate into your wilderness EDC. 

ULTEM®

ULTEM® was created for use in the aerospace industry and designed to remain mechanically stable under extreme conditions. It resists stress cracking under when coming into contact with fats and oils from food, alcohols, acids, fluids used for servicing cars and aircrafts, and other aqueous solutions. ULTEM® it is also resistant to ultraviolet rays and gamma radiation (so, you know, just incase you were ever exposed). It is also inherently flame resistant.

Design
Details

The ULTEM® Signal Whistle features our popular Mk2 style pineapple pattern for sure grip in just about any weather conditions, rain or shine. The 120dB rating ensures its signal can be heard in location, emergency and SAR scenarios. Coming in at only 2.8g and includes an optional MILSPEC stainless steel ball chain. 

Tools for
Explorers

Along with being made in a highest performance, advanced polymer, this signal whistle is amazingly light and a very small form factor to be unburdensome in anyway; perfectly suited to be included in your wilderness EDC kit. An essential tool for any modern day explorer and deserving to be part of our Special Projects Division product line up.

 

Product Specs

Materials

  • ULTEM®
  • Stainless Steel

Approx. Dimensions

  • 2.0" / 50.70mm OAL x 0.385" / 9.90mm Diameter

Approx. Weight

  • 0.1oz / 2.8g

Features

  • Machined ULTEM®
  • CNCed Mk2 Style Pineapple Pattern
  • Neck Chain or Key Ring Loop
  • High Pitch Sound Rated to 120 Decibels
  • Featherweight
  • Will Withstand Extreme Conditions
  • Includes MILSPEC Stainless Steel Ball Chain
  • Comes Packed in SPD Storage Tin

Marks

  • SPD Logo on Packaging Tin

Imported

Customer Reviews

Based on 2 reviews
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J
Jack McWilliams
The ULTEM Signal Whistle – Built for the Unexpected

I’ve handled a fair number of signal whistles over the years, but the PDW ULTEM Signal Whistle is in a class of its own. Machined from aerospace-grade ULTEM—a high-performance thermoplastic known for its strength, heat resistance, and chemical stability—this isn’t just another piece of kit you throw in your pack and forget. It’s something you depend on.

The form factor is sleek but substantial. Lightweight enough to carry on a lanyard or keychain, but with just enough heft to remind you it’s there when needed. The precision machining is what you’d expect from Prometheus Design Werx—flawless. The whistle chamber is clean and unobstructed, giving it an impressively sharp, loud tone that easily cuts through wind, forest, or urban din. In a survival situation, that could make all the difference.

A few thoughtful touches stand out: the lanyard hole is reinforced and sized perfectly, and the finish gives it just the right balance of grip without snagging on gear. And since it’s made of ULTEM, it won’t corrode or crack under pressure—making it ideal for everything from backcountry expeditions to maritime emergencies.

Whether you’re a seasoned outdoorsman, EDC enthusiast, or just someone who appreciates bulletproof design, the PDW ULTEM Signal Whistle is one of those rare tools that merges minimalist aesthetics with maximum function. An impressive little piece of engineering that might just save your life one day.

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B
Bill Boyington
Didn't receive item

Still waiting on someone from support to reach out and address my email.

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