1. Hardwood frame: which use solid oak wood to make tenon, fixed with glue. 2. With imported textile fiber rope material for bottom render, pure American craft, 8 directions ties up, with independent coil spring structure. 3. Sandwich type seat cushion with dolls pearl cotton and goose down material, no sagging. 4. packing: use Plywood, Density foam, Non-woven Fabric, Moisture-proof pearl cotton, Carton Board, Shrink film, vacuum packing or according to client's requirement. 5. Foam cotton: fire-resistant standard in American California. 6. Size: F028-S:W88"x D40 1/2" x H38" F028-C: W37 1/2"x D40 1/2" x H38" F028-O: W29"x D23" x H19"