TECH-P Pilates Mini Exercise ball - 25cm (7" to 9") Stability Ball for Pilates, Yoga, Training and Physical Therapy-2 Pack Pack of 2 Blue New Pilates Yoga 8" Fitness over ball bender. Great for Pilates, yoga, balance and core training, weight training,indoor and outdoor sports. Recessed needle valve (comfort) vs. pertruding plug. soft rubber surface and comfortable with cushy feel. Requires inflation (straw included)