I'm currently using these folding prop blades with my Multiplex Easy Glider Pro, and these are totally strong, stiff, light and efficient.
The blades fit perfectly the 8mm root hub of my red Multiplex spinner.
The alloy insert is an ingenious idea. The M3 mounting screws fit flawless.
Actually, I replaced these, for a pair of Graupner 12x6 ! I had previously mounted. These blades look beautiful and shiny with the carbon weave finish. I plan to get a second pair soon.
Thank you Hobby King, keep up the good work!