Diamond Articulators are the fastest, most accurate, and most durable dental model system available. Patented features allow easy separation of upper and lower trays, and easy pin placement guide, and engineered pins and pinholes to maximize die stability. Each box of 100 complete Black Diamond Articulators comes pre-assembled and ready to use. Each Box includes 5 posterior stop rods. Pins are sold separately. You will need about 400 pins per 100 set box.