These needles are the correct length, and should not puncture the liners if adequately employed WARNING: Item can not be returned or exchanged if liner is broken or punctured due to inappropriate inflation or needle use A flexible liner suitable for various head shapes offers convenience and balance Detachable moisture-resistant https://adultmediumspeedflex29936.smblogsites.com/30731817/new-step-by-step-map-for-speedflex-adult-large