JW Pet Invincible Rubber Chains for Dogs. JW® Invincible Chains® provides your dog with the rubber texture he loves to chew on. Solid, no glue construction stands up to the abuse. A terrific tug as well - easy to hold on to while your dog tugs with all his or her might. Enjoy a game of toss and tug with this unique dog toy. Features include rubber rings with rope. Durable, great for interactive play, this JW dog toy is ideal for tug and fetch. Ships in assorted colors. Patented No Seams Technology makes this toy stand up to the strongest tuggers Rubber rings are one solid piece; no glued seams to tear apart Made with durable, natural rubber Great for multi-dog households Works as a tug or chew toy Available in: Double Large: 10" L x 6" W x 0.75" T Triple Small: 7.5" L x 3.5" W x 0.75" T Triple Large: 15" L x 6" W x 0.75" T