★This bed is "customer assembled furniture"★ For "customer-assembled furniture," we ask that customers unpack, assemble, and install the product themselves. Large lift-up slatted bed with thin standard bonnell coil mattress Gas pressure cylinder that can be opened and closed easily even by women A gas pressure cylinder is used for the opening and closing part. It is designed and adjusted to move smoothly with light force. This structure is also used in car hatchbacks. Durability performance tested by international testing institute Load capacity: 150kg Will the product withstand daily use? Will it malfunction? Tests for "load capacity" and "number of openings and closings" are conducted by a third party. We have checked the durability and safety of this product so you can use it with confidence. Inspection Report Passed 10,000 open/close tests (Opening and closing once a day is equivalent to approximately 30 years)