1.pocket springs units made of High Carbon Manganese Steel Wire. 2.guarantee 15 years! 3. 80g/m2 non woven fabric. Pocket Springs Units / Coils Specifications: Manganese Wire#72 High Carbon, A GradeWire Diameter1.4-2.4 mmSpring Height60-220 mmMid-Coil dia.45-75 mmTurns4-6Spring TypeCylindrical , BarrelNon Woven Fabric80 g/m2, white, blue, gray Zones3-7 ZonesSizeQueen,King,Single,Twin, ...