 The first Aeropresses were moulded of clear polycarbonate, then later of copolyester, clear and later tinted.AeroPress switched to copolyester in 2009 because unlike polycarbonate, copolyester does not contain Bisphenol A (BPA).To reassure customers still using the original models, they also claim that testing they performed showed no leaching of BPA into brewed coffee from the polycarbonate.