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IMPORTANT-READ CAREFULLY-RETAIN FOR FUTURE REFERENCE a) All assemby fastenings should be tightened properly and that care should be taken that no fittings are loose. b) Maximum thickness of mattress:13.5cm, the max mattress thickness must not be over the maximum mattress thickness marking marked on the upper bed. c) Recommended size of the mattress:L190*W90*H13.5cm.