Price:Negotiable

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Description:

made of high quality steel materials, all spring are withheattreatmentand anti-rust treatment

1.bonnell spring, inner spring, formattress                             

2.  head ring: 60mm--90mm 

3.springheight:10--19cm                

4.wire for springs: 2.0mm  2.2mm 2.3mm 2.4mm