TopHat ® Heulspitze with UNC thread A tip of the arrow during flight, a long-drawn wail gives forth. Once Heulspitzen were used to transmit signals, today it is used as toys by children and adults. Material: Aluminum (AL) Aluminum is used because of its low weight - to come up with a twice as long on top of the traditional weight. Aluminum is corrosion resistant. TopHat ® Heulspitzen high technology: Consisting of two parts screwed, and the Heulspitzenkörper Heulspitzenkopf. The head is hollow and Heulspitzen has a transverse hole, causing the whistling sound is produced. Screwgate: TopHat ® Heulspitzen were specially equipped with an O-ring screw lock - the tips no longer resolve in the insert and account for a subsequent tightening. Installation: The Combo TopHat ® tips are screwed all the way into the insert or adapter.