Box Spring Mattress Comfort Bonnell Spring Mattress OEM Size QTY/20' FT(PCS) QTY/40' HQ(PCS) King Size(76*80inch) 193*203*28cm 100 300 Queen(60*80inch) 152*203*28cm 150 420 Double(54*74inch) 137*188*28cm 150 480 Twin(39*75inch) 99*190*28cm 250 600 FAQ 1. Are you a factory for goodnight mattresses or trading company? A: We are a professional mattress manufacturer, so we can control the mattress quality di…