The One Speed is a training device specifically designed for golf swings that helps to regulate the rhythm of your swing and maximize a player's potential. ■ Product Name: 1SPEED (One Speed) Orange ■ Weight: Approximately 330g ■ Functions and Effects (Manufacturer's Description) The One Speed allows you to take the club back slowly with good rhythm, check the head position at the top, feel the "flex" and "return" of the shaft with your body, and practice swinging through to the finish quickly. By then swinging your own clubs with the same feeling, you can increase your club head speed.