IINNII Putting Alignment Mirror Training Aid,size 7.0'' x 12.0'' - Practice Your Putting Alignment Tool

When using it I realized that it is very short and the marbles forces to put the put up quickly, making the direction vary a lot, instead of encouraging that put down so that the path of the stroke is more consistent.

Cant adjust the width of the putter gate, also came in assembled wrong. Returned it.