Looks like all the rest of the bci-6 carts.
To be fair I'm not using them in the context of a normal cartridge because they've been used to replace sponged carts that were originally supplied with a CIS from MIS Associates.nifty-stuff.com said:websnail, I don't have very much (almost no) experience with the insides of OEM Epson printers, but the couple I've seen dissected didn't have sponges. The spongeless you are using in your C88, are those replacing an OEM sponged cartridge?