Carbine

Carbine is a compound. This compound can be found on Earth Two.

History
After traveling to Earth Three and defeating Jay Garrick, Zoom captured him, dampened his speed with a mask, and as a secondary measure, imprisoned him in a carbine chamber.

After killing Deathstorm and Reverb for disobeying him, Zoom snatched Barry and imprisoned him in a carbine cell, from which he couldn't escape.

Zoom showed to be able to pass through the compound with extreme ease, and then proceeded to pummel before, and then sped off. With the encouragement of a normal guy, Barry was able to finally phase out of the chamber.

After stealing Barry's speed, and thereby curing himself and amplifying his speed even more, Zoom abducted Caitlin and took her to his lair. There, she met Killer Frost, who Zoom trapped in a carbine chamber. But by working together, they were able to destroy the chamber.

Specifications
Carbine is a unique compound, that can't be phased through by speedsters easily, and Killer Frost's powers don't affect it. However, Zoom showed that he can easily pass through it, due to his speed having been tremendously boosted by the Velocity serum.