Blue Canvas Tacks 17mm For large works Head diameter: Approximately 6mm (due to the oval shape, there are variations) Total length: Approximately 17mm (slight variations in length) Material: Iron Color: Blue Weight: 100g Number of pieces: Approximately 230 The manufacturing company that made these canvas tacks in Japan has gone out of business, so this is a rare item, available only while supplies last. [Product Description] These canvas tacks are made from tape-shaped materials, unlike the round wire canvas tacks currently on the market. The feature is that the nail tip is very sharp, making it easy to stand on the canvas, and it is difficult to come out because the nail tip bends when driven in. However, due to the manufacturing process, the head shape is oval, and the shaft is wedge-shaped, and each nail has slight variations, making them unique. Please understand this.