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 reliable, durable and have very good and progressive resilience.
It export by compressed, and It's still have good condition after releasing.
Product materials are all 65-70# steel, which form over ten product varieties in three categories. The products can product 80-200mm high springs with steel wires of 1.6-2.2mm, suitable for making soft mattress of different sizes.