Our Colorful resin X back chairs have the following advantage points: 1. Can be stackable and easy to remove. 2. Just pass the American and European test of BIFMA & EN12520 for our resin x back chairs. 3. Three years quality Guarantee 4. Our colorful x back chairs can choose difference seat, solid seat and rattan seat 5. using indoor and outdoor both 6. available color, white, black, green, red, yellow and so on.