These needles are the correct length, and will not puncture the liners if correctly applied WARNING: Product can't be returned or exchanged if liner is broken or punctured on account of incorrect inflation or needle use A flexible liner made for various head shapes gives ease and comfort and balance https://adultmediumspeedflex50485.thekatyblog.com/30056643/the-2-minute-rule-for-riddell-speedflex-adult-large