These needles are the proper size, and should not puncture the liners if appropriately used WARNING: Solution can't be returned or exchanged if liner is destroyed or punctured as a result of poor inflation or needle use A flexible liner designed for different head styles gives consolation and security Detachable https://cristianwalgs.tokka-blog.com/30968536/the-fact-about-adult-medium-speedflex-that-no-one-is-suggesting