The Dogtra Training Box is specifically designed to fit the Dogtra BALL TRAINER. (2) Dogtra Training Boxes come in this set. 

Light weight and durable, the Dogtra Training Box is made out of fluted polypropylene sheets to provide the least distracting material odor. Its light weight and durable structure allows for versatility and portability during and after detection training sessions. The top cutout is placed perfectly for the launcher part of the Dogtra BALL TRAINER.