This are 1045 drone blade. The Biggest size drone blade.
Diameter- 25.5 cm.
Those are carbon fibre made blades. Tougher one and good aerodynamic shape.
Drone Blades 1045,25.5 cm Dia
There are Two Blade one is ClocckWise and Other is Counter Clockwise.
and with this Round Blade Rings are also provided as per the pic.
Package Include --
1 x CW Blade
1 x CCW Blade
2 x Black round attachment rings.