our jv miner was the best quality of india the grade of a/m/b/c 5-100ton /per month also has the Quartz Building Material Edition can supply we also the world "s famous brand oem maker email:longturn1965@yahoo.com.tw Our quartz is 95% similar to the top brand like Caesarstone (Israel) And cosentino (Spain) Some of the quartz slab for these big companies are from India. Our factory at the moment make as OEM. So we dont really know what is the brand in korea and Japan. Qty depends on thickness of slab. For example 2cms - 4000 to 4500Sqft 3cms - 3000 Sqft