These needles are the correct duration, and will not puncture the liners if correctly made use of WARNING: Product can't be returned or exchanged if liner is ruined or punctured due to incorrect inflation or needle use A flexible liner designed for many head shapes provides convenience and balance Removable https://riddellspeedflexadultlarg32578.blogdemls.com/30807962/facts-about-speedflex-adult-large-revealed