Introducing the Einstein named after one of our client's grey's, Einie. This is a great toy for greys. My two absolutely love to fight over it. It has a variety of textures to tantalize including plastic popsicle sticks with holes, plastic chain, plastic saucers, and wooden washers, all attached to a plastic baseball with 3/16" cotton rope and lots of knots. 2mm chain, 3.5mm wide jaw quick link, and washers all stainless steel. A crowd pleaser for sure!