Size: Inner diameter 3.0 mm,outer diameter 6.0 mm, total 500 points in 5 sheets. High-Precision Scanning: Used for featureless objects, perfect for reverse engineering, autoparts, dental, jewelry, inspection, and more. Maintain precise alignment throughout the scanning process for reliable data and reference points. Easy to Use: Our markers are designed with adhesive foil for effortless application and removal. User-friendly and hassle-free, they ensure a seamless experience for both professionals and beginners.