Bonnell spring used in the manufacture of mattresses, sofas and seating group generally 68-96 spring diameter, 90 mm-180 mm height. Springs, are rolled into packages of approximately 25 kg each, palletized and covered to protect from unfavorable external conditions and finally stretch nylon wrapped ready for shipment. Bonnell springs demanded as such are lined up as a frame with 1.30 mm and 1.40 mm helical wires. The bonnell spring sizes made by Boyçelik can vary to meet customer demands.