The long groove on the board is positioned to enable you to cut out large leaves and petals such as Arum Lily leaves and Longiflorum Lily petals. There is ample space on the goorved side of the board to work on petals. The reverse side is smooth for rolling out flat pieces of Sugarpaste. A non slip mat is supplied with the board. Size: 300 x 250 mm. Warm hand wash with soapy water. Do not expose to extreme heat.