Name of cartilaginous rings supporting tracheae and their branches in insects?

In insects, the tracheae and their branches are supported by structures called "tracheal rings" or "spiracles." These rings are typically made of a chitinous material that provides rigidity while allowing flexibility. Unlike the cartilaginous rings found in vertebrates, the tracheal rings in insects are more segmented and can vary in their arrangement and structure depending on the species. They play a crucial role in maintaining the shape of the tracheal system, facilitating efficient gas exchange.