These needles are the right duration, and will not puncture the liners if correctly utilized WARNING: Merchandise cannot be returned or exchanged if liner is broken or punctured due to incorrect inflation or needle use A versatile liner made for many head shapes delivers comfort and ease and balance Detachable https://adultmediumspeedflex69920.blog-a-story.com/10959836/the-ultimate-guide-to-adult-medium-speedflex