Secretewriters are very much popular in the magic industry, like bug writers & swami gimmicks there are many different versions… This is a chalk writer specially made for prediction on the slate. You can use real chalk with this gimmick. This gimmick is specially made for chalk with a perfect grip for secret writing. With this gimmick, you can easily write on the slate. This gimmick uses real chalk, no special refill is required, easy to use. Easy to refill, use any slate. We will supply you special gimmicked thumb with an instruction video, use your own slate.