Black Balance Ball Size is approximately 50-60cm. Recommended for core training, exercise, yoga, and improving posture while working from home. It's a convenient size for home training. ★ Please understand that this is a used item and may have some scratches due to being stored at home. ★ Will be folded small and shipped in simple packaging. ★ Please consider purchasing only if you understand that this is a used item. ★ Air pump is not included. Please be aware of this.