We are the honest supplier in China. We always offer dead burned magnesite in good conditions. Chemistry analyze (% ) size (mm) Mgo sio2 mgo L. o. I. B. d (g / cm3) Zsms-93 93 3. 5 1. 6 0. 3 3. 2 Zsms-92 92 4. 0 1. 6 0. 3 3. 2 Zsms-91 91 4. 5 1. 6 0. 3 3. 30 Zsms-90 90 4. 8 2. 0 0. 3 3. 2 Zsms-89 89 5. 0 2. 5 0. 5 3. 18 Zsms-87 87 7. 0 2. 0 0. 5 3. 18 Size can be available according to customers' requirement.