Material: Silicone Package include: 2 Pcs Nipple Corrector The features of Silica Gel Nipple Corrector: 1. Non-toxic, odorless, high transparency, not yellowing 2. Material soft, elastic, not deformed 3. Long useful life, no cracking. Cold-resistant and high temperature resistance. Advantage: Soft design at skin contact surface with corrector, the soft silicone can protect your nipples from injury during long time wear. Productor Features: 1. Easy to use: no need to use other auxiliary tool, gently press can make it suck up firm,don& 39;t drop 2. You can control the suction according to personal comfort: slightly press the top (small suction),press down half (medium suction), all press down (the maximum suction) 3. Comfy skin touch: Imported food-grade silicone, soft and comfortable 4. Not allergies: High quality material 5. Excellent air tightness, Super suction 6. Simple disinfection: silicone material have 120 degree heat resistant, same disinfection methods with baby pacifier. Blanching for a few minutes,convenient and clear for secondary use