This item is a Jute Wrapped Training Dumbbell. It weighs just over 13oz and is made of hardwood. The dumbbell is used in hurtle work. The jute wrap works so well to get a new or young dog to take the dumbbell in its mouth. New dogs usually don't like to hold the dumbbell in their mouth so the jute just gives them that motivation to keep the dumbbell in their mouth until you give them the out. The reason this jute wrap works well is because many bite training toys and bite sleeves are made of jute.