1,Quantity and Size The set comes with 20 sheets of 3D scanning markers, with each sheet containing 50 pieces, a total of 1000 pieces. Inner diameter is 6mm, outer diameter is 10mm.2,High Performance These 3D scanner markers feature high reflectivity, tear, water and sun proofing, well ink absorption and can be repeatedly attached.3,Working Principle The markers are made with bright reflective film on PET film, with a layer of reflective glass microspheres adhered through aluminum plating, printed in hollow circular reflective points based on specific size using screen printing.4,Accurate Scanning These markers provide accurate data for 3D scanning, reverse engineering, metrology, and inspection applications. Designed with adhesive foil, easy to apply and remove.5,Wide Application Suitable for use in the field of motion data acquisition with 3D scanners, such as 3D motion capturing and gait analysis. The markers reflect light emitted by the equipment typically infrared light for data collection, processing. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin