This 2: Whistle with matching plastic coil wristband is attached by a split key ring. This is a great fit for any safety program. Whistles are perfect for joggers, walkers, seniors, and students. The split key ring is a great way to keep your house or car key with you when you are out for that walk or jog. Available in 4 colors. Product Size: 1 7/8"w x 7/8"h.