These needles are the proper size, and may not puncture the liners if appropriately applied WARNING: Product or service can't be returned or exchanged if liner is damaged or punctured due to improper inflation or needle use A versatile liner created for different head styles supplies ease and comfort and https://speedflex-adult-large60360.suomiblog.com/5-easy-facts-about-adult-medium-speedflex-described-46653529