Great Little Kitchen tool! It's small so don't expect a large board. The work surface measures about 2 1/4 inches wide by 4 3/4 long. It's 5/8th's inch thick. Plenty thick. The handle is over 3 inches long. I wish more people would get into specifics in their reviews so you know what you're getting. In terms of the groove depth, they are deep enough. If they were deeper, you'd be pressing pretty hard on the dough and it would probably just rip. The groove is 1/8th inch deep. I've used it a few times and it does make nicely shaped gnocchi. Check out the Youtube video on how to use one. It's very informative. Enjoy!