These needles are the correct size, and should not puncture the liners if correctly applied WARNING: Item can not be returned or exchanged if liner is harmed or punctured because of inappropriate inflation or needle use A versatile liner designed for many head shapes offers consolation and steadiness Removable moisture-resistant https://judahihjmw.blogminds.com/the-basic-principles-of-adult-medium-speedflex-28535062