Tweaky 144 "Ian444" Edition, designed for 3.5" props and 1306/1407 motors.

Quick specs:
Weight: 13.9gm 
Frame size: 144mm
Frame thickness: 4mm
Motors: 1306/1407
Motor mount spacing: 12mm
Motor mount hole size: 2mm
Motor center hole size: 6mm
ESC/FC hole spacing: 20x20mm
ESC/FC hole size: 3mm
Arm width: 4.0mm
Max prop size: approx 98mm (3.85")

Build pic with BrotherHobby 1407 motors, weighs 99.1gm without battery:

All of our "true x" frames are cut so that the grain of the carbon fibre sheeting runs down the length of the arms, rather than the conventional layout which has the grain running at a 45 degree angle. This dramatically increases the strength of these super-thin-arm frames, and requires a different, less efficient layout for AP to cut the frame, and thus is more costly. We consider our frames to be premium and cutting-edge, and that the extra cost of these unconventional frames is justified.

For more information visit:
https://www.rcgroups.com/forums/showthread.php?2883082-Tweaky-the-people-s-frame-and-its-variants