The Chiarugi oboe staples come in many sizes. They come in brass or silver. The company explains that the staples are drawn from a full bar of brass or nickel silver and then they are completely turned outside and inside using high precision machines and automated systems. This produces high quality consistent tubes. Tubes are covered on 2/3 of their length with high quality cork from Portugal. In addition, they are finished up and checked manually by highly experienced personnel. The brass O-ring staples have three rubber O-rings in place of the cork which act as the seal for the tube inside the oboe reed well.
Chiarugi 2+ staples work well with the Caleb shaper tips.