Product Features 1. The finger scratch protection cover is made of environmentally friendly plastic material, which is stable and safe to prevent children from scratching their fingers by touching the aircraft during flight; 2. Tailor-made, lightweight design, only 3.5g per pair, does not affect flight and endurance: 3. Note: The upper and lower covers cannot be used at the same time. Using them at the same time will cause the air volume to be too small to provide flight lift, and the aircraft will fluctuate up and down: Product parameters Finger scratch protection cover [upper] Product net weight: 1.9g (1 piece) Product gross weight: 18.5g Product size: 4.9*4.9*0.7cm Packaging size: 8*5*3cm Boxed Finger scratch protection cover [lower] Product net weight: 1.6g (1 piece) Product gross weight: 20g Product size: 4.5*4.5*0.9cm Packaging size: 9*5*3cm Boxed