A ONE WOOD CAFT Hard Plaster System. meeting specifications for Squash Court which makes it a total thickness of 12 - 13 mm. Due to extremely hard nature of plaster a slight uneven color distribution may be seen once the plaster has dried, this doesn't affact the strength or integrity of the plaster and must not be considered as a defect. Area : Wall plaster playing area is only below red lines totaling to approximate 1065 SqFt laid down by "REBOUND wsf Approved”The system consists of a 10 mm base coat with silica sand top coat of 2-3 mm. A ONE WOOD CRAFT Sound Board System : Apex Sport Surfaces India Squash Court Sound Board System (7 feet x 17 inch) x 3 Nos; Tin board of 22 gauge.