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What is an Open Coil?

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What is an Open Coil?

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Open coil spring units (Bonnell) are the most common type of springs used in a mattress. They come in different types of firmness. Soft, Medium and Firm. Technically referred to as, 13.5 Gauge – Soft mattress, 13.0 Gauge – Medium and 12.5 Gauge – Firm.

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