The toy is hollow and can be filled with treats that will be gradually dispensed as the dog chews

Adjustable arm is 6" tall

Double cap rivet construction

K9-402-Plus (2 Dogs - 2 Receivers) Additional Contents

Threaded Scent Detection Tube tab The toy is hollow andAvailable in 6" or 9" lengths Heavy duty PVC tubing Removable fitted plastic caps [split] Redline K 9 threaded scent detection tubes are made from a heavy duty gray PVC and include fitted plastic caps that screw on and off for easy access. Tubes are drilled with small holes to allow release of scent during training. Light weight and easy to hide, these tubes are perfect for scent detection work.