This geometric shape board has been a valuable tool in my classroom. I teach young multi-handicap children, many of which have motoric, visual and/or sensory difficulties. I am very selective in looking for the best products to use with my students. This large knobbed shape board makes grasping and moving the pieces a successful experience for my students with Cerebral Palsey. I use this durable shape board to work on manditory national/state academic standards. This means that it is used daily in multiple ways and is sanitized daily as well. This is a high quality product that continues to withstand rigerous use. I encourage you to see for yourself.