Petmate Jw Invincible Chains Double Solid natural resilient rubber Tug, toss, fetch and chew toy Long lasting dog toy Single seamless large ring made without glue.Suitable for medium and large breed dogs The Invincible Chains Large Single is a single durable ring made from natural resilient rubber. JW's patented molding process creates ring with no seams and no glue to produce a strong long lasting toy.