1. There is a cork pea in our whistle. Our cork pea is made of natural large wooden cork, which is different from synthetic pea. When you blow it, it vibrates at a higher frequency, causing the whistle to emit a louder sound. It can reach up to 120db quickly. 2.High Quality--- Made of food-grade 304 stainless steel. Contrast that with plastic whistles or fake ones’; no matter how you use them, you don't have to worry about breaking them. It always looks like a new one. 3.User-friendly--- Each whistle comes with a soft braided lanyard for hands-free use. 4.Package--- 2pcs stainless steel metal whistle with lanyards. You can use it anywhere you need to get others’ attention quickly. You can use it as a coaches whistle, referees whistle, sports whistle, PE teacher whistle, police whistle, pet training whistle, whistle, emergencies whistle, party favors whistle，and more. 5.Good Service--- Our whistles are strictly inspected before leaving the factory; please rest assured to useurs.