thinkbaby's products address the growing concern over toxic chemicals leaching from baby products. thinkbaby's 5oz. and 9oz. baby bottles are made from Polyethersulfone(PES)plastic, which gives them their natural golden color. The bottle has been specifically formulated to be free of Bisphenol- A and toxic chemicals. Included is an anti-colic nipple made from surgical grade silicone and a travel cap. Dishwasher safe, top rack recommended. Packaged in recycled materials. Recommended by: Healthy Child Healthy World. Be sure to get some slow, medium and fast flow nipples also. Want to extend the life of the bottle? Consider purchasing the thinkbaby Conversion Kit for the next step in feeding. The Kit will convert any thinkbaby baby bottle into a Trainer. Produced in Taiwan.