This tug is made with a hidden compartment to hide narcotics in when training a dog to search them out. The reason this tug works well is because the dog is motivated to get a bite on the tug as a reward when found and is more anxious to search for it. You can also put treats into the hidden compartment for other types of dog training. The tugs overall measurements are 13”x5”, body size 9”x5”. It is made of tuff cordura materials, double stitched construction with heavy 10” nylon handle. The hidden compartment is not exposed to the stuffing of the tug so the tug will not get contaminated.