Material: hard aluminum
color: silver, gold, black, customizable
surface Treatment: hard oxidation
specification: length 56mm * width 15mm * thickness 8mm
packing: OPP bag
packing: 2000/box
weight: 10g
functions:

1. Personality whistle design, the overall design is novel, high-frequency treble, light blowing and easy ringing.
2. The double-hole design can send out 80-120 decibels, and can play its performance in harsh environment in time.
3. Aluminum alloy material, safety and high performance overall reflect the tough outdoor style.
4. Elaborate incision design makes the air vibration more high-frequency sound brighter and spread further.
5. With keychain, lightweight, easy to carry and use.