How to use clip many documents and write comments etc. I use it hard outside. Unfortunately, this product does not seem suitable for such usage. First, the spring load of the clip is weak, and the document will fly with the wind. Also, when you use it in, you will peel away the part covering vinyl and cover with hand sweat. Vinyl cover will be torn from the outer corner. I think that this product is suitable for use like when checking something in the room with few documents. For those who use it hard, Sekisei's "clip file foam beauty" is very good. I am using it now.