This toy is made with a plastic baseball which comes in a variety of colors. The 2mm chain, 3.5mm wide jaw quick link, and washers on the bottom of the chain are all stainless steel. The wooden beads which come in a variety of shapes, sizes, and colors are fastened onto the ball with untreated leather and the 1/8" leather is tied four times on each bead for those parrots out there who like undoing knots. Great for those mechanical Cockatoos.