Firm Spring Mattress Specifications: 1.Wire 2.3mmcarbon manganese spring, the springs with twice heat-treatment, perfect elasticity; and ametabolic; 2.Filling with natural resin cotton, soft and breathable; help to promote blood circulation which is good for your health; 3.Natural soft cotton, green environmental, comfortable and breathable which is good for health. 4.High quality knitted fabric is imported from Belgium, fine and soft, and good breathable to take care your skin. 5. Themattress with quality guarantee for over 15 years and with best cost performance. Detailed Structure : Top High quality knitted fabric ( anti-mite , germproof )160g/m2 fiber polyester1.5cm foam, density 25kg/m31.5cm foam, density 25kg/m3non-woven fabricMiddle 1cm latex, density 70#350g/m2 white pad ( soft )320g/m2 white pad ( firm )2.3mm wire guage spring system ( 17cm height )320g/m2 white pad ( firm )350g/m2 white pad ( soft )Bottom non-woven fabric1cm foam, density 22kg/m31cm foam, density 22kg/m3High quality knitted fabric ( anti-mite , germproof )----------- Important Note: 1) Any size available. Do as customer's request. 2) Queen Size & King Size always have stock. 3) Offer 15 years guarantee 4) Production Capacity : 30000pcs/month 5) Loading Capacity of 40HQ = 120 260pcs ( un-compress packing ) 6) We can adjust the Coils, to make the mattress areable to compress. Quality unchanged.