I had a problem before ordering this pencil. Everywhere I looked at this pencil, other than Amazon, did not tell what "Regulator" meant. I sent a question to amazon buyers asking why it was called a Regulator and received the answer, it can be adjusted to allow a pre-determined amount of lead to advance in one push of the top. I have 0.5 mm and a 0.3 mm and I really like them both. I have nothing to say against the "Regulator" mechanical pencils. They are a little heavier than some pencils but they feel balanced. I thank Amazon buyers of this pencil for answering my question before I ordered them. 5 stars... Randy