These needles are the proper size, and may not puncture the liners if adequately made use of WARNING: Products cannot be returned or exchanged if liner is broken or punctured because of poor inflation or needle use A flexible liner suitable for various head shapes offers consolation and balance Detachable https://speedflex-adult-large52771.qodsblog.com/30828027/not-known-factual-statements-about-adult-medium-speedflex