It's made from 0.2 mm thick plastic card, cut into thin strips. Pressed gently with finger tips to form it over the wing ribs then secured in place with thin CA adhesive.
Mike
Alienware Aurora R5 Windows 10 64 bit Intel i7-6700K 4.2Ghz Two GTX 1080 Foundations in SLI (8 Gig each) 32 Gig DDR4 2133Mhz 1TB SSD boot drive - 1TB SATA storage drive 5.1 Surround Sound 34" Dell Ultra Sharp U3415W (3440x 2440) CH Pro-Pedals, Stick and Throttle TrackIR-5 Pro