Modular Rat & Rodent Customizable Tunnel System

Description:Give your rats or rodents this cool playground with this fully modular "Headquarter" system! Whether you want to build a simple straight run or a multi-level labyrinth, this system allows you to expand and reconfigure their habitat.I designed this with my son's two rats in mind, focusing on their specific needs and size. However, I assume it should also fit perfectly for mice, guinea pigs, gerbils, degus, octodons or hamsters.Technical Specs:Internal section: 100mm x 100mm.Wall thickness: 5mm.windows holes: dia 8mmSafety: Parts connect via an internal clip system hidden within the walls, ensuring a smooth interior surface that won't snag paws or tails.More extensions and new modules may be released in the future. I’m happy to hear any ideas or feedback you might have! :-)Included Parts:Regular parts: Straight Block: The standard section for main runs.Half Straight Block: For adjustments, often necessary depending on your custom layout.5 mm spacer: For adjust