This grass is high quality and durable with an overall thickness of 42mm (40mm Pile Height). It is sold by the linear metre of 4m wide. Each unit is 4m wide by 1msq. When you add to basket, 1 unit is 4sq metres. As an example if you require an area of 6m x 4m = 24 square metres you would need to add 6 units to your basket. Click on the link below for measuring instructions.