There is a breakout of a Calcutta 400 here (http://www.shimanofishing.com/service/diagrams/calcutta-400.pdf). It looks like it has more than 2 washers (the 150 and 250 only have 2) and I'm not sure if they've changed them all to that new Dartanium or still sell the felt ones (or whatever that stuff is). Just call customer service and they should be able to figure it out for you (that's what I did).

My 150 was getting very sticky. I cleaned it but didn't have a drag washer so I just lubed up the old one. It helped but it wasn't perfect. I got these new ones, lubed them up, put them in and the drag is smoother than I could imagine.

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You can't catch tomorrow what you kill today - please practice catch and release.