I purchased our yellow lab's first Zisc at a retail store a few years back. The center of the toy was more substantial then. As time went on the center eventually split. I began purchasing the disc through your website hoping coming directly from you that the disc might be stronger. Maximus enjoyed this toy so much I just had to buy another....then another....then another. I even give them as gifts. I appreciate the "green" thinking behind the Zisc, but you really need to make the center stronger. I only use the disk for play time. It's not treated as a chew toy. Today I have purchased two more. I have to decided to return the split ones for recycling & to request my one time replacement Zisc. I'd like to add Max also own two hurleys(one's at Nana's house), a Bumi, & a Tux, all of which will be enjoyed for many, many years to come.