The Belly is made from a very durable plastic. I designed the part and own the molds for them. The Belly is 2 halves. A special bolt and barrel nut hold the 2 halves together. You can unscrew the Belly bolt and to empty the bank over and over.
The Belly kit fits our 13, 20, and 23 inch banks. The kit includes the 2 Belly halves and the special nut and bolt, and shipping for $19.99.