Habitrail OVO Trail AccessoryThe Habitrail OVO 10" tube allows you to extend length to your design so you can make it as high or as long as your hamster can go. All around perforations improve airflow and ventilation to ensure your hamster's home is always fresh. Includes: 10" lime green tube, lime green lock connector and an aqua window. All Habitrail parts and accessories can be used together, sold separately, to create a network of passageways for your hamster to discover. In addition, the lock connector can also be used with all Habitrail parts and accessories.