★This bed is "customer assembled furniture"★ For "customer-assembled furniture," we ask that customers unpack, assemble, and install the product themselves. Multi-layer super spring mattress 【size】 Single: (approx.) Width 97 x Length 195 x Height 16 cm Semi-double: (approx.) Width 122cm x Length 195cm x Height 16cm Double: (approx.) Width 140 x Length 195 x Height 16 cm [Main materials] 1.6mm wire diameter multi-layer super spring (Number of coils: single: 810, semi-double: 1026, double: 1188) Filling: Urethane, felt, palm pad Covering: Polyester, cotton, rayon (double-sided multi-needle quilting, antibacterial, deodorizing, and anti-mite treatment) [Color] Ivory [Quality guarantee] 5 years (2 years manufacturer's warranty + 3 years distributor's warranty) [Country of Origin] Japan [Package size and weight] Single: (approx.) 98 x 195 x 16 cm, 17 kg Semi-double: (approx.) 123 x 195 x 16 cm, 22 kg Double: (approx.) 141 x 195 x 16 cm, 26 kg *To ensure that you can use your mattress for a long time, we recommend that you change the position of the head and feet or turn the mattress over once every 1 to 3 months.