Customized Pocket Coil Spring - Durable Mattress Pocket Spring Coil Unit Professional pocket spring factory supplying high-quality pocket spring units designed for mattress and sofa manufacturing. Offering customizable specifications to meet diverse production requirements. Factory wholesale high carbon steel coil spring units with SGS certification. Product Specifications Product Name Mattress Pocket Spring Unit Material High Carbon Steel Wire Wire Diameter 1.0mm-2.3mm Head