The product is a set of crank connecting arms for Schwinn Airdyne AD4 and AD3 exercise bikes. These arms are designed to be used in a gym or training setting, providing a sturdy and reliable option for fitness enthusiasts looking to enhance their workout. The included pins ensure that the arms are securely attached to the bike, allowing for a smooth and efficient exercise experience. Made by the trusted brand Schwinn, these connecting arms are a high-quality and durable component for your exercise routine.