Our balls are of good quality. It is made of soft PU leather and is lined with rubber air pockets. All footballs on this link are heat bonded footballs. Size reference: No. 4 ball - circumference: about 63cm weight: 350-400g suitable for children No. 5 ball - circumference: about 69cm weight: 400-450g suitable for adults notes: 1. Note the ball size indicated by the color. 2. Please allow 1-2CM difference due to manual measurement. 3. Due to the computer screen resolution, contrast and many other factors, the actual color may be slightly different from the picture. Thanks for your understanding. Inflatable: yes Material: PU Color as shown Size: Size 5 or Size 4 Surface material: high-grade PU Applicable people: men, women, adults, children, teenagers, students, league Features: High quality soft touch, wear-resistant Applicable place: lawn