1. Material: PU 2. Process: yarn winding, machine sticking 3. Application: training, examination, competition, etc. 4. Applicable people: No. 4 is recommended for adolescents 5-12 years old, and No. 5 is recommended for people over 12 years old. 5. Circumference: No. 4 is about 62-65 cm, No. 5 is about 68-70 cm 6. Weight: No. 4 is about 320-360 grams, No. 5 is about 420-445 grams 7. Note: delivery is not inflated, please purchase inflation tools by yourself Features: 1. Using PU shell machine stitching, it has good stability in use and comfortable touch feeling 2. 24 pieces of skin, beautiful and delicate, soft and not hurting your feet 3. Selected thick thread machine sewing, tight and orderly 4. Elastic rubber air nozzle with butyl liner, strong air tightness, high elasticity and aging resistance 5. Wear-resistant leather, excellent non-slip, increase sports performance 6. Yarn wrapping process, the inner bladder rubber wraps the yarn, which is not easy to be deformed 7. Machine pasted skin, machine pasting technology, strong and resistant to beating 8. Technology middle tire, standard elasticity