Terp pearls or terp balls are little glass balls that spin around inside a banger and help improve the vaporization of concentrates. To use just simply drop a terp pearl into a banger before heating it up. Then heat up the banger as usual and the terp pearl will heat as well. Terp pearls help push around concentrates for a more even draw.
*Emerald only describes the color. Not actually made out of Emerald