These needles are the proper duration, and should not puncture the liners if properly employed WARNING: Product or service can't be returned or exchanged if liner is broken or punctured due to incorrect inflation or needle use A flexible liner made for different head styles supplies consolation and balance Detachable https://speedflexadultlarge28461.canariblogs.com/rumored-buzz-on-speedflex-adult-large-45944936