[CONFIGURATION: Stereo rainbow effects reflective leather + Color changeable blue leather + High air tightness bladders + Multilayer wrapped yarn + Golden LOGO process + Handcrafted sewing. Size 4 Circumference: 60-62CM Weight: 320-360g. BALLS DO NOT COME INFLATED. CHARACTERISTICS: The independent patent solves the shortcomings of the poor friction of the first generation of reflective leather. We specially customize the bottom layer for the second-generation reflective leather which greatly improves the integrity of the ball and make reflective leather closer to the feel of composite leather. INSTRUCTIONS: Please note that when the reflective leather needs to be matched with the flash of the mobile phone the "glow" effect can be taken on the mobile phone screen. Color-changing leather can change color under sunlight. INTERNAL FEATURES: Full-fledged effervescent gall bladder is used to maintain durability. A 200-meter-long winding thread is used on the surface of the bladder to enhance the overall texture and maintain the stability of elasticity. We are not afraid that you open the ball to check if we really use enough wrapping yarn QUALITY CONTROL: Quality assurance from the inside out multilayer wrap yarn process with high grade butyl bladder ensures the stability of the soccer ball. All manual fitting process to ensure quality.]