Made with ABS, more durable than other plastic whistles. These whistles are great for referees, coaches, training, teachers, survival, emergency, school, gym, etc. The whistle sound is loud and clear. The whistle measures 1.81″ x 0.71″ x 0.87″, exquisitely compact and easy to carry! Each whistle comes with a black lanyard, you can hang easily around your neck, or on a wall mount, helps you free your hand. Whistle support customization, logo process for silkscreen and pad print. The prices for 23000pcs or over are based on ocean shipments.