Features: Isolate the blades to avoid injury or damage caused by foreign objects and improve flight safety. high-toughness materials, strong impact resistance and compression resistance, reducing accidental damage to the machine. Strengthened structure, and the anti-collision for protection is further upgraded. Lightweight and compact in size, portable to carry and store, does not affect flight use. Quick release designed, for Sjrc F11S, Sjrc F11 Pro, F11, F11S, F11 4K PRO, ContixoF24 Pro, Ruko F11, Ruko F11 Pro drones, easy to install and disassemble. Specifications: Material: ABS+PC Color: Black Net Weight: about 105.7g Front for Protection Ring: Approx. 22x15x3.5 for cm/8.66x5.90x1.37 inch Rear for Protection Ring: Approx. 22x18x3.5 for cm/8.66x7.08x1.37 inch Applicable Models: for Sjrc F11S, Sjrc F11 Pro, F11, F11S, F11 4K PRO, ContixoF24 Pro, Ruko F11, Ruko F11 Pro Note: 1.Does not include Drone, 2.Transition: 1cm=10mm=0.39inch, 3.Please allow 1-3mm error due to manual measurement. please make sure you do not mind before ordering, 4.Due to the difference between different monitors, the picture may not reflect the actual color of the item,please make sure you do not mind before ordering Package includes: 4 Pieces Blade for Protection Rings