The Booty Training System by Crane is a resistance band specifically designed for fitness training. It targets the glutes and thighs, providing a great workout for those looking to strengthen and tone these muscle groups. The band is made of metal and rubber, ensuring durability and resistance for various training exercises. With a compact size of 9 3/4 inches in height and 7 3/4 inches in width, this portable fitness equipment is convenient for use in the gym or at home. The model number ASP-US-169 signifies the specific design of this resistance band for achieving the desired fitness goals.