Sonic Disks are small metal disks created and used offensively by Evolved Sonorosians that can create sound waves.
In Ultimate Alien, 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.
In Omniverse, 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.[DJW 1]
Sonic Disks can continue flying and attacking when Ultimate Echo Echo transforms back to normal.
Sonic Disks are vulnerable to electricity. Plus, if the Sonic Disks are electrocuted, their user is vulnerable to it as well.
Sonic Disks are not very durable, as they can be destroyed by a Techadon robot's laser blasts or an Anodite's mana attacks.
Ultimate Echo Echo first used his Sonic Disks in Map of Infinity to battle some Necrofriggian colonists.
In Absolute Power: Part 2, Ultimate Echo Echo used the Sonic Disks to battle Ultimate Kevin. During the battle, it's revealed that the sonic disks can multiply and perform a move called "Sonic Doom".
Sentient Ultimate Echo Echo used the Sonic Disks to distract Gwen inside the Ultimatrix in The Ultimate Sacrifice.
Negative Ultimate Echo Echo used a group of sonic disks and sends them flying to surround Eye Guy and project powerful sonic blasts that injured Eye Guy's ears in The Ultimate Heist.
- If Echo Echo goes Ultimate, any Echo Echo clones active at the time transform into Sonic Disks.