The signature power of all Green Lanterns is the ability to conjure "constructs:" solid green objects that the Green Lantern can control telekinetically. These can be anything, such as a disembodied fist to beat a foe, a shield to block an attack, a sword to cut a rope, or chains to bind a prisoner. Whatever their shape or size, these constructs are always pure green in color, unless a Lantern is skillful enough to know how to change the EM spectrum the construct emits. Hal Jordan has shown the ability to have a construct emit kryptonite radiation under Batman's guidance.