EASY TO USE: Just fill the base with water and it automatically will become heavy enough to hold itself in its place. There are "Non-skid pads" under it which keep it in one place. It simulates a real experience so all you do is unwrap the cord and hit the ball as hard as you want and the and the ball will bounce back to you.

FLEXIBLE CORD: The cord is 15 feet but can stretch 30 feet for hard hit balls. If you would like to shorten the rebound, wrap the cord around the base of the unity to the length you want.

PERFECT TRAINING TOOL: This is one of the best devices to get help sharpen you tennis skills at any time of the day. You can warm up with it, practice your strokes, and work on your swing speed

CAN USE IN MANY ENVIRONMENTS: These can be used almost anywhere including garages, basements, driveways, backyards, or bring it to the court with you.

PACKAGE INCLUDES:  1 x base, ball

Accept no substitutes. Beware of nasty imitations that do not hold well or do the job intended. Only purchase the official Self Training Tennis Tool from AllStar Products