The patented ATT Vibratory Roller Cassette is the only integrated vibratory cassette in the world. With an operating frequency of 83Hz transferred through two 63mm diameter rollers there is no better method of achieving fast true putting surfaces on the market today. Efficient integration of sand top-dressing deep in to the turf canopy is easily achieved.. When using the Vibro Brush Attachment, efficient integration of sand top-dressing deep into the turf canopy is easily achieved. Even if the top-dressing sand is damp you can simply attach the brush attachment and aid integration by brushing simultaneously while vibratory rolling. The Vibro Brush can also be used without vibration by switching off the drive to the Vibration Cassette thereby making it perform as a static brush.