Mingder Double layer Belt type Mineral stone-silica color sorter machine -- www.hefeimd.com/en ---Hefei Mingde Optoelectronic Technology Co., LTD Can sort various big size stones, rocks up to 150mm dimension. Welcome to our factory ! Tel:0086-551-62578095 www.hefeimd.com Mobile/whatsapp: 008613966725592 Skype: dianahongsmile