This set of 4 water bottles from PEARLPET is made from PET material. They are sturdy, long lasting and durable. The bottles have been crafted from BPA free material and are tested to ensure that they are made from food grade material. These bottle are freezer safe and can be used as a fridge bottle too. You can keep an eye on your water intake as the bottle is translucent. The bottles are designed with a wide mouth and a tight-fitting circular cap which ensures that there is no leakage of water. You can easily use these bottles on the go in your office backpacks or gym bags.