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By sitting on the core cushion, you can easily create proper posture and core exercises. By using the core cushion on both feet and one foot, you can train your core and muscle strength throughout your entire body. The small bumps make it slippery. Compact type that does not take up much space, and is lightweight so it is convenient to carry. Product Number: WJ-9092 / Core Cushion; Size: Approx. Diameter 13.0 x 1.4 inches (33 x 3.5 cm); Weight: Approx. 21.2 oz (900 g); Material: PVC; Country of Origin: China