These needles are the right size, and will not puncture the liners if effectively applied WARNING: Product or service cannot be returned or exchanged if liner is weakened or punctured on account of improper inflation or needle use A flexible liner made for several head styles provides convenience and steadiness https://speedflex-adult-large04505.digitollblog.com/30557271/the-ultimate-guide-to-riddell-speedflex-adult-large