This kind of dog agility training kit contains 8 cones with 3 holes on each side and 4 interlocking jumping rails which make it easy to adjust heights for your dog to jump. Those are professional football training marker cones. It is especially useful to train your dog both physically and mentally.Features: Made of durable PE material Lightweight material makes it more portable Train pet\'s sense of balance To form a strong relationship between you and your pets Teach pet to follow the orders correctly Easily to change the height of the crossbar