... grade silicone 2. Low & High heat resistance 3. Unbreakable,durable,anti-aging 4. Ful-fill FDA,LFGB,SGS 2011 new design silicone ... elasticity, strength and thickness; easy to assemble. Easy flow and anti-colic: Bottle with soft baby and with air vents in ... flowing and avoiding colic symptoms. Durable and economy:silicone is anti-aging, not deformed, sterilizable and resists high and low temperature(-50 ...