Aikiou Stimulo Level Three Tubes
These additional tubes, sold to be used in conjuction with the Aikiou Stimulo, enable you to increse the difficulty of your standard Stimulo.  The longer the tube is, the more skillful the cat must be to retrieve the food or treat.  By placing the longer tubes in various positions on the Stimulo, you vary the difficulty level significantly.  The Level Three tubes each hold 3/4 cups of food and are manufactured from food grade plastic and are diswasher safe.