The Bfight has become popular recently due to its weight and strength.
The carbon is cut correctly and looks like a serious contender if you're looking for something agile, fast and strong at the same time.
 
Weight comes in at only 59g!!
Please note you will need 4 x 10mm screws to go through the arms and into the stack which should leave 2mm for the stack standoffs to hold on to.
 
Description:
Item name: Bfight210 FPV Racing Frame 
Wheel base: 210mm
Type: normal X frame 
Material: 3K carbon fiber
Thickness of frame arm: 4mm
Thickness of top plate: 1.5mm
Thickness of bottom  plate: 1.5mm
Weight: 59g (with screws)
Standoffs: M3*12*25mm