I bought this for my kids to use on a magnetic whiteboard for our homeschool. They like it for the cute star design, and its size and shape make it easy for them to hold in their hands. I like it because it sticks to the whiteboard which helps them not to lose it like they were doing with the regular rectangular eraser!There are three layers that make up the eraser. On top it has a thick, yellow foam layer that forms the star design. The foam is soft to the touch, but dense enough that it keeps its shape well. The only downside I've found is that if the kids accidentally mark it with one of their dry erase markers, it's not going to wash out. Under that is a second layer of magnet that makes it stick to the whiteboard. The magnet on it is fairly strong so it grasps the whiteboard without any slipping or sliding, even when upside down. The bottom layer is the eraser itself. It's a "tight weave" eraser, so the fibers that make up the eraser are dense, unlike the rectangular Expo eraser which has loose mesh fibers.It erases fully and completely without smearing or leaving a ghosting effect. I even found that it allows for erasing along that hard to reach inside part of the metal frame where the kids love to trace along the edge. It's a fun design and a functional eraser at the same time. A great purchase!