The 3S Hitting System Pro Model (Ages 17 and Up) PRO model - For advanced high school (age 17 or older), college and professional level players 3S stands for "Swing, Speed, and Strength," since this system works all three at once! Utilizes Reistance Tubing Technology inspired by Speed Training Bring the 3S with you anywhere and practice your swing anytime Kit Includes: Swing Blaster Bat Attachment Swing Stabilizer Shoulder Strap Resistance Tube for Swing Blaster "Self Connector" Strap that allows for set up anywhere Door Attachment for set up using a door frame How to guide Card providing resources for best use of 3S Carrying bag - whole kit ships in bag