Flat Compressed Pocket Spring Unit for Sofa Seat Cushion Optimized for efficient furniture container loading and export, our flat compressed pocket spring units provide superior comfort and durability for sofa seat cushions. Product Specifications Product Name Pocket Spring for Sofa Items Material Steel Wire Steel Diameter 2.2mm (Can Be Customized) Head Diameter 5.3-6cm Middle Diameter 6.5-7.0cm Spring Height 12cm Coils Turns 4-7 Turns Coils Counts According to the demand of