These needles are the right size, and will not puncture the liners if appropriately employed WARNING: Solution cannot be returned or exchanged if liner is ruined or punctured on account of incorrect inflation or needle use A flexible liner designed for various head designs offers comfort and ease and steadiness https://shanesykvt.bloggazza.com/30002537/the-single-best-strategy-to-use-for-speedflex-adult-large