10-Piece Precision Hardness Pins: This set includes 10 pins graded Mohs 1 to 10 for accurate identification of mineral and rock hardness levels, suitable for professional-grade results. Ergonomic Star Grip Design: The unique 10-point star shape provides a secure hold and smooth rotation, enhancing efficiency and comfort when conducting hardness tests in both lab and field environments. Simple & Intuitive Operation: Easily scratch the test surface and compare results using the included Mohs hardness reference chart. The design requires no training, making it quick and user-friendly while maintaining precision for professional applications. Durability & Reliability: Made from high-quality materials, these pins are built for long-lasting performance and repeated use, perfect for educational labs, mining applications, and quality control inspections. Service: We place great emphasis on our customers' shopping experience. If you have any questions, please feel free to contact us; we will respond to you within 24 hours!