Premium Aluminum Alloy Construction: This sturdy and long-lasting carrying case has a hard aluminum alloy build exterior and it is interior has an impact absorbing form wall border to protect your gears from sudden drops and impacts Two-layer Customizable Foam: The carrying case features one layer of customizable pre-diced foam that can be removed to fit your systems and accessories including transmitters, receivers, and headset/lapel mic. You can design your own compartments. Suitable for Phenyx Pro dual-channel wireless microphone systems like the PTU-71, PTU-52, and systems from other brands Specification: External dimension: 43.5 cm X 32 cm X 10.5 cm. Internal dimension: 42 cm X 30 cm X 5.7 cm. Weight: 1.7 kg. The medium size case is the same size as the Phenyx Pro PTU-71 system. If the form insert is damaged, you can replace it with the original form insert from the Phenyx Pro PTU-7000/5000 system package Metal Strap Reinforcement: Metal strap reinforcement to the exterior of the carrying case, extremely sturdy rugged build quality to endure heavy use, and frequent transportation during tours/shows