The Winning TB-8800 heavy bag is crafted from the Japanese synthetic material クラエース (Kura Ace / Clace). This is a high-grade artificial leather / high-performance polymer, commonly used in professional sports equipment and premium accessories. The material originates from the Japanese chemical industry and is often associated with Kuraray, a global leader in advanced synthetic materials. Key material benefits: Exceptional abrasion resistance for intense daily training Lightweight yet highly durable construction Moisture- and sweat-resistant surface Easy to maintain compared to genuine leather Leather-like look and feel without the drawbacks of natural leather This makes the Winning TB-8800 an excellent choice for professional boxing gyms, combat sports clubs, and serious athletes seeking long-term reliability. Delivery time is 30-60 days.