1、Compatibility: The upper protector is compatible with the for Noble NB4, for NB4 Pro transmitters while the lower protector is compatible with the for Noble NB4. This ensures a snug fit while effectively protecting your transmitter. 2、Premium Material: Made from premium metal materials, they are designed for longevity and robust performance. They provide strong stability and durability, ensuring your transmitter is well protected against everyday wear and tear. 3、Easy Installation: The simple structure makes them easy to install and detach, allowing you to switch them out quickly without hassle. You can install your transmitter's protectors in just a matter of minutes. 4、Stylish: With a stylish and modern look, they not only provide guard but also elevate the aesthetic appeal of your transmitter, making your transmitter cooler and more attractive. 5、Ideal Replacement: These protectors are a convenient solution for directly replacing old or damaged parts. This means you can refresh your transmitter's look without the need for complicated upgrades or modifications. Item Type: Transmitter Protector Material: Metal Applicable Model: Upper Protector is Suitable for Noble NB4 NB4 Pro, Lower Protector is Suitable for Noble NB4 Upper Bracket: Approx. 78x108x15.8mm / 3.07x4.25x0.62in Lower Bracket: Approx. 80.5x103x13mm / 3.17x4.06x0.51inc 8 x Accessory 8 x Screw 2 x Hex Wrench