indoor stone step Exquisite workers Experienced export process Strict inspection ISO9001:2008/CE ... availableshanxi black, G684,shanxi black, mongolia black,volakas,etcStone FormStair (Step/Riser)Thickness1.5cm,2.0cm, 3.0cm, 4.0cm etcSizes110 ... ,Black,Yellow etcSurface finishingpolished, honed, flamed,bushhammered,water-jet,etc.Edge processing Full Bullnose, Half Bullnose, Demi Bullnose, Flat eased, ...