Come and Check Our Branding Solutions.Stainless steel material ensures the whistle durable. Louder Sound,double tubes can provide up to 150 decibels,can be heard for far distance. Convenient and practical,with kering and carabiner keychain,can tie on your backpack,belt.Perfect for traveling,camping,hiking,climbing. Customized is available. Pls check inventory and detailed info before placing your orders.