These needles are the proper size, and will not puncture the liners if adequately applied WARNING: Solution can not be returned or exchanged if liner is ruined or punctured due to improper inflation or needle use A flexible liner made for many head designs presents comfort and ease and stability https://riddell-speedflex-adult-l25615.xzblogs.com/72116674/top-guidelines-of-adult-medium-speedflex