These needles are the right length, and should not puncture the liners if appropriately utilized WARNING: Merchandise can not be returned or exchanged if liner is destroyed or punctured due to improper inflation or needle use A flexible liner designed for many head designs provides ease and comfort and stability https://speedflexadultlarge94598.thechapblog.com/30124601/the-definitive-guide-to-speedflex-adult-large