Incredible erasable ink pens

My son told me about these and at first I didn't believe him. A pen with ink that can be erased?! But they really do exist: Frixion erasable roller ball pens by Pilot, they are brilliant! I don't know about you but because I tend to type most things these days rather than write, so when I do use a pen I often make a mistake and have to start again which is so frustrating and time consuming! With these you just erase over mistake like you would pencil and carry on. What's more, they are great for kids. In the past when Archie has handwritten something that is wrong, he hasn't wanted to correct it for fear of his work being untidy, but thanks to these pens seems more than happy to correct mistakes now! They are just over £5 for 3 from Amazon.