Material: pure medical grade siliconeunbreakable, safely used in microwave, freezer and dishwasher safe, easy to clean and heat-resistantanti-dust, odorless, more durable and long lifespan, easy to wash and handle replicates the tactile experience of breastfeedinghelps reduce baby feeding problems like colic, spit up and refluxbottle type: wide mouth, natural flow, anti-coliccustomized designs, sizes, logos, and colors are accepted.