Negative Circles Material 3/16″ steel body Group of 3 mounted on steel disks 3, 4, 5x $645. (30″ x 66″ @ 42 lbs) A smaller group version is also available: 2, 3, 4x $585. (30″ x 53″ @ 35lbs) plus shipping Note: sizes refers to the number of points on each piece