These needles are the correct duration, and will not puncture the liners if thoroughly applied WARNING: Products cannot be returned or exchanged if liner is damaged or punctured because of improper inflation or needle use A flexible liner designed for various head shapes delivers comfort and ease and steadiness Detachable https://riddell-speedflex-adult-l17215.affiliatblogger.com/83138385/the-basic-principles-of-adult-medium-speedflex