These needles are the proper length, and may not puncture the liners if appropriately used WARNING: Item can not be returned or exchanged if liner is weakened or punctured due to inappropriate inflation or needle use A flexible liner suitable for various head styles gives comfort and ease and steadiness https://reidcilpj.getblogs.net/63244124/the-single-best-strategy-to-use-for-adult-medium-speedflex