... are the manufacture for production Pocket Spring mattress, Massage pocket spring, Zoned mattress spring, Inner spring, Pocket coil, Pocket Cushion Spring, Sofa Spring, Seat Spring, furniture spring,, Zigzag spring, etc. in China more than ... cover with zipper for easy care and machine washable pocket spring mattress Features1) The inner spring with hight carbon steel wire , line uses Lura ...