inner spring:spring unit for mattress
anti-rust flexible
enormous spring unit size
bonnell spring unit:
sort:bonnell spring unit
function:made for mattress
size:1)steel wire range:1.8mm--2.5mm
2)the Dia. of the end:60mm--90mm
3)the Dia. of the waist:30mm--60mm
4)height:6cm--26cm
5)turn:4-7turns
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