Sputniks are part flat stick, part square, part bundled rod. Each corner is fitted with a 1/8_ black polypropylene rod. Each rod has an adjustable _ nylon bead. There are 3 x O rings. The inner O Ring can be used to pull the white slats tightly together and the outer O rings are used to pull in the black rods. The slats are bendable, so they can be manipulated to produce different sounds and bounce. By adjusting the O rings forward or backwards, it is possible to produce a very tight bundled rod sound or a very loose attack sound like multiple drummers playing slightly out of sync.