The Hu Friedy Dental Hygiene Instruments 2 Set includes a total of 10 pieces with 2 sterilization cassettes. This dental hygiene instruments set includes various models such as Gracey 1/2, 11/12, 13/14, S204, H5/33, and Explorer Probe, making it suitable for use in dentistry, general surgery, and orthodontics. Each unit is made in the United States and is designed to meet the needs of healthcare professionals in a dental setting.