Bonnell Spring we produce with turns(about4-8 turns) steel coils interconnected in rows by helical,The wire guage and the coil count, which depends on the ciol diameter(about 1.8-2.4mm).they are used for mattress or sofa inner core. They are reliable, durable and have very good and progressive resilience.
It export by compressed, and It's still have good condition after releasing.