Bonnel springs used in the manufacture of mattresses and sofas generally 100 mm -160 mm height. The springs are shipped in packages of 25 kg as well as on pallets and stacked upon demand. Bonnel springs demanded as such are lined up as a frame with 1.30 mm and 1.40 mm helical wires. The bonnel spring sizes made by Boyçelik can vary to meet customer demands.