This grinding disc uses diamond as abrasion and combined with composite material. There is sticky cloth on the back to stick on, easy and convenient. Features: 1, Using diamond as abrasion and combined with composite material. 2, Using special binding agent. 3, It has strong grinding force and smoothness. 4, It can polish quickly and use for long time. 5, There will be no color left on stone after polishing. Specifications: Diameter: 100mm or 4" Thickness: 4mm Granularity: 50 or 100 or 150 or 300 or 500 or 800 or 1000 or 1500 or 2000 or 3000(optional) Used for: 1, Processing of artificial stone, granite, marble, etc. 2, Refurbishment of ground or stairs which are made of granite, marble or artificial stone. Package includes: 1 x Grinding Disc Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.