The WP 120 3mm is for robust 1S 3 inch or ultralight 2-3 S bilds. The 120 has a slightly smaller footprint than the 124 as the and is best suited for smaller backyard spaces. 

Version 4.1 slightly increases the strength at the middle of the motor mount.

Frame: 120 mm MTM, 3 mm thick

FC: 16 x 16 stack, 25.5 x 25.5 AIO square orienation, 25.5 x 25.5 AIO whoop orientation 

Motor: 2 mm on 9 mm diameter

Props: 3 inch

Canopy: Zip-tie Canopy or the new Printed canopy.(see the canopy tab for the file https://ko-fi.com/quad66/shop)

Weight (aproximate): 6.4 gm