These needles are the right duration, and may not puncture the liners if appropriately used WARNING: Merchandise can not be returned or exchanged if liner is weakened or punctured due to improper inflation or needle use A flexible liner suitable for different head styles offers comfort and ease and security https://riddell-speedflex-adult-l72160.blogzet.com/not-known-factual-statements-about-adult-medium-speedflex-45578262