Specifications: Material: PVC Size: 22-25cm/9 inch pilates ball Package Include: 1 mini exercise ball & 1 resistance band Features: 1. Anti-burst ball is made of eco-friendly, hypo-allergenic PVC material, safety, anti-burst, durable, soft, flexible, non-slip, no water absorption, easy to clean 2. Birthing ball can be easily inflated with included tube and breath, pump not required, mini diameter makes the ball convenient to carry and store 3. Anti-burst and non-slip ball remains elastic and squishy when fully inflated and is to stay in place while performing yoga, pilates, or physical therapy exercises 4. Soft pilates over ball great for pelvic floor exercises and targeting muscle groups in hard to reach areas, core training, and physical therapy, improves balance Recommended by a professional physical therapist: Small exercise balls are perfect to help improve stability and coordination, maximize strength and endurance, strengthen the core muscles. It's suitable for yoga, pilates, and physiotherapy.