I was worried that having 10 colors would make it too thick and difficult to use, but it's about 6 centimeters around, so it was fine. There was no protection for the pen tip, but all the colors came out properly. Changing colors requires pressing the top once, which is a bit of a hassle, but the lines were finer than I expected and easy to write with. There's no pen clip, but it's thick, so it takes up space in a pen case. It's cheaper than a 100-yen shop, and it's perfect for using with friends.