Reduction of jibs from 6 to 4 + optimized duct geometry increases thrust by 11% - while maintaining uncompromising durability. Optimized attachment brackets reduce frame vibration amplitude for ideal PID step response. Optimized PP blend makes it impact Pilot-focused details: motor fixing slots, motor screw protection structure, enlarged FC mounting holes (25.5 x 25.5 mm), and reduced duct profile. For Air75 II weighs only 4g, 10% lighter than Item:FOR Air75 II Brushless Frame Wheelbase:75 mm Motor Mounting:3-M1.4-6.6 mm Flight Controller Mounting Holes:25.5 x 25.5 mm Battery Slot Dimensions:16.3 x 6.3 mm Color:A:Blue Material:PP Package Contents: 1 * Brushless Frame Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.