Flint Egyptian Natural Pebbles PRODUCTION: The total production is 25000 - 30000 ton per year and our plan is to increase the production to be 40000 during 2023. â?¢ Our pebbles are used as a grinding ball into ball mills (ceramics industry) The high silica content ( 98.8%), and the hardness (7.5 on the Mos scale) as well as the rounding make our flint pebbles is an exceptional quality, with the local companies and the export territories. Size: 40 mm : 60 mm 60 mm : 80 mm 80 mm : 100 mm Chemical and Physical Analysis Si02 >= 99.31% Al203