These needles are the correct size, and will not puncture the liners if correctly utilized WARNING: Product or service can't be returned or exchanged if liner is broken or punctured on account of poor inflation or needle use A versatile liner suitable for a variety of head shapes delivers comfort https://riddell-speedflex-adult-l64404.smblogsites.com/30732468/the-basic-principles-of-adult-medium-speedflex