120dB Titanium Survival Emergency Whistle Multi-purpose 4-in-1 EDC Outdoor Gear
Size: Total length 134mm, storage tube: about φ14mm, whistle: about φ10.86mm. They are made of TA 1 pure titanium and are very lightweight, durable and portable. 4-in-1 Survival Solution Ultra-Light & Durable TA1 Titanium Body: Only 48g!