The Visio colour coded gates come in a pack of 3 sizes (RED 60mm, SILVER 55mm and BLACK 50mm) which when placed at specific distances from the ball, on your chosen target line, will create a specific angle of error that you will need to achieve in order to successfully putt the ball through the gate.
Practicing with the gates on your chosen line is an interesting challenge of your ability to start the ball on a specific line when you consider at 10 ft 1 degree of error would be lined up to the edge of the hole, while at 20ft 0.5 degree of error would also be lined up to the edge of the hole.
Therefore on a straight 10 foot putt you will need to develop accuracy of less than 1 degree of error in your starting line to be successful, or at 20ft less than 0.5 degree
Training with both different gates at different distances will give you feedback on the club face angle and quality of strike at impact and as a consequence will help train your ability to start the ball successfully on your line and improve the accuracy of your putts on the golf course.
The putting gates also come with an indoor holder so you can use the gates for your indoor putting practice. Each leg securely fits into one of the two supplied bases to allow the gate to stand alone on any hard surface
A tape measure is also supplied so you can precisely place the gate at exact distances to be sure you are practicing with known quantities of error. Such diligent practice will give you accurate feedback on your ability to start the ball on line