Check out our Copper Thermal Strap flexibility demonstration videos. TAI also offers stiffness graphs taken from several custom and standard model copper thermal straps we've manufactured.  While the data gathered is not a guarantee of performance in your own design (as stiffness is a function of the rope/cable/braid type, the rope length (RL), number of ropes and number of rows), it can provide you with a rough understanding of what to expect (in N/mm, on each axis). Contact TAI for more information.