Compressed Roll Packing Pocket Spring Unit for Sofa Export Bulk Shipping High-quality 1.8mm diameter steel pocket spring coils designed to provide excellent comfort and support for sofa furniture manufacturing. Product Specifications Specification Details Product Name Pocket Spring For Sofa Material High Carbon Steel Wire Wire Diameter 2.2mm (Can Be Customized) Head Diameter 4-6.5cm Middle Diameter 4.5-7.5cm Height 6-25cm Turns 4-7 Turns Coils Counts According to client