Good quality Build. Be aware though, I tried this as a Pusher Prop (turned blades around), and the main trust from this prop turns out to be the middle surface and the 6x4 specification is quite deceiving, it draws way more Amp than a regular propeller. On a Bixler 1.1, as a push prop, my D2826-6 2200kv motor and both my 30A & my 50A ESC ran way too hot. The 6x3 folding prop (Folding Propeller 6x3 W/ Alloy hub 35mm / 3.2mm shaft / PRODUCT ID: FP35-6x3-3.2) is perfect to use on Bixler 1.1. / 2200kv / that one measured @ 280W 3S 24Amp.