The Custom Heavy Punch Bag is crafted from 1 mm PU grain vinyl, making it exceptionally strong and resilient for maximum longevity. To provide a realistic training experience, the bag is designed with a center-aligned weight that ensures maximum force dispersion and balance. The bag also features a 1.2" poly sponge rubber inside liner that helps maintain its round and cylindrical shape. Additionally, the bag includes a reinforced tie-down steel D-ring on the bottom for added security and floor securing if desired. Overall, the Custom Heavy Punch Bag is a durable and reliable heavy punch bag that is perfect for anyone looking to improve their training regimen.