The Sonic Disks are disks created and used offensively by Ultimate Echo Echo that can create sound waves.
If Echo Echo goes Ultimate, any Echo Echo clones active at the time transform into Sonic Disks.
Ultimate Echo Echo and Sentient Ultimate Echo Echo's Sonic Disks are a black disk with a light blue circle on one side which is where the sound waves are created.
Negative Ultimate Echo Echo's Sonic Disks look just like his head.
Sonic Disks fly at a target and project powerful sonic blasts, which can knock someone out, shatter steel, or even crush a military tank, with relative ease.
Sonic Disks can duplicate themselves and can duplicate Ultimate Echo Echo.
In Greetings from Techadon, it's revealed that the Sonic Disks can continue flying and attacking when Ultimate Echo Echo transforms back into normal.
Sonic Disks can be stopped by electricity. Plus, if the Sonic Disks are electrocuted, their user is vulnerable to it as well.