This acrylic is 15" by 30". At first I didn't feel up to the large size. And especially after I slammed the trunk of the car on my thumb. The pain finally went away and I was able to find a warm and windless view of the ships. There was also a very pretty marina to my left. But I chose the view to the right of the Carquinez bridge. The large size was much better for my brushwork. I think I need to stay about this size or larger.