These needles are the proper size, and should not puncture the liners if effectively used WARNING: Merchandise cannot be returned or exchanged if liner is weakened or punctured because of improper inflation or needle use A versatile liner suitable for several head styles provides comfort and ease and security Detachable https://adult-medium-speedflex49106.topbloghub.com/37090909/indicators-on-adult-medium-speedflex-you-should-know