Oakwell 37mm Artificial Grass "Whilst Stocks Last"37mm Thick grass. The Oakwell is a realistic artificial grass with a mixture of browns and greens and a heavy grams per square meter. This grass is proven to last, and with a 10 year warranty you can be confodent with your purchase. This is an excellent choice for landscapers. In stock; Cut to length at 0. 250 mtrs intervals. 4 mtrs widths only in stock. 5mtr widths are available with a couple of days notice.