These needles are the proper size, and will not puncture the liners if correctly utilised WARNING: Merchandise can't be returned or exchanged if liner is harmed or punctured on account of improper inflation or needle use A flexible liner created for many head designs provides comfort and ease and security https://adultmediumspeedflex54792.bloggip.com/31005334/little-known-facts-about-speedflex-adult-large