its not necessary to have. The only purpose it serves is to help break up the pellets in the bottle. You put the marble in the bottle nwith the partially dissoved pellets. Put your thumb over the top of the bottle and shake around. The marble will shake and break up the tren much better. BUt you do not need it. You can crush it yourself with something just make sure to be sterile.
i didnt have a marble so i got some mcdonals straws and stapled 1 side closed, put the pellets in, and rolled a glass over the top several times. worked great.
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