My Crystal mattress, is design for users whom prefer to sleep on a mattress which is hard and firm. Well sold to users from are age 35 and above. For customers whom have back ache or spine problem, this is highly recommend. If you are buying a mattress for your parents, you can consider My Crystal.
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http://www.mydigitallock.com.sg/five-star-hotel-mattress.html
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http://www.mydigitallock.com.sg/products/mattress-and-bed-frame/my-president-mattress-my-hope-single.html
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