Double tube high frequency survival whistle blasting whistle aluminum alloy whistle metal whistle manufacturer
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Product name: high frequency double - chamber survival whistle
Principle: high frequency double cavity resonance
Features: easy to blow sound
Volume: 118 db
Main material: aluminum
Surface treatment: anodic oxidation
Dimension: 56MM long, 15MM wide and 8MM thick
Weight: 9.5 G
Custom colors and logos are acceptable
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