The actual glass tube size will be smaller than the backing size. Material: The neon signs are hand-bent from real gas-filled glass tubes. They are not plastic LED. Installation: Metal backing or acrylic backboard have a chain for hanging. We can accept change color if you want. Our neon sign have. If you still need the sign, we will send you a new replacement parts (new neon tube) for FREE, and also enclose an instruction to help you to easily replace the broken tube. It is an available choice to return the broken sign. We can customization, please leave us your design and requirement, and we will give you a price and size. We will try our best to solve problem for you.