can't say I've ever seen them, so there could be wires for all I know. I just know that they don't actually perform classical ballet, it's half modern music, half classical songs, and they get kicked if they lose too much weight. The guy who created this wanted to do the whole fat people can be ballerinas too thing, but since its inception it lost any serious connotations it was supposed to hold and they dropped the weights lower to make them less shit.