... ,top service 3.Thickness:12,15,20,30mm 4.Foshan quartz engineered quartz stone ,quartz stone,quartz slabQuartz Stones SC315 Leaving its image without any trace, noble ... wear≤70mm³9Impact strength1kg heavy solid steel ball 30 cm from th height of quartz rock falls,quartz stone surface does not crack.10Surface qualityNon ...