PowerTek material construction. Triple stitched seams. Easy bladder removal. Size: 9 in. Manufacturer's warranty included. Punch up your training with the Amber Sports Champ Speedbag Black. This speedbag is made of PowerTek material and features triple stitched seams to insure quality and durability. Bladder can be easily removed. Manufacturer's warranty included - see Product Guarantee for complete details. About Amber Sporting Goods Inc. Dedicated to bringing athletes and enthusiasts the best in training equipment for a variety of competitive sports Amber Sporting Goods offers everything from boxing accessories to kickboxing equipment from martial arts training products to soccer goods. No physical training stone is left unturned as Amber Sporting Goods strives to create the market's threshold for quality and innovation. From karate to boxing Amber Sporting Goods has you covered.