Ovation and Ultra waterbed bladders are made by Dreamlover Waterbeds Australia
These are manufactured in Queensland Australia. Our heavy now 900 gram per square meter layers are the foundation layers. We increment these with a 400 gram layer to give the various levels of medium, firm, extra-firm and hard. This makes baffles a lot more reliable to tangle and degrading. 
Ovation comes with a full 5 year warranty Ultra come with a full 5 year warranty including the baffles inside ( we are the only one to include the baffles)
Please note that some companies claim that they make their own label bladders. What is not mentioned is that they are made in China. Their selective information to you. Their layers start at 450 gram/sq meter, half ours.
Wave reducing bladders on this site are not fully imported but are a product of Dreamlover Waterbed World