Black hard plastic. Nice size for price. The number wheel is metal and about 9". Most wheel are $1000+ for 18" and the number wheel is plastic and under 7". This nu.ber wheel is good size and metal. I don't think it will warp. To spin the ball, the channel is deep.
Good size and #1 thru 36 are 4: x 3.5", dozens are 3.5" x 14".
It works great. We just love it