HI....Okay, now you have me curious...how can I find out? Could it be the rubber they describe that comes off the inside of the colon when it gets cleaned out ...It is certainly like rubber. Maybe it started to rip off with the laxative I had to take with the cleanse. Hum, these mysteries are what keeps you going and you just want to clean your body. That reminds me of a story of a friend of mine who loves a really clean house. Years ago she got the idea of cleaning her over with toilet bowl cleaner and she put it on and left it for a while...She came back and the walls of the oven were gone...So with that I will go at this job saftly and with caution....thanks, angela