I make my own out of empty ring free bottles. Just cut the neck down a little on two, stick them together and duck tape them real good, add line and some lead and you have a good one. They work well, I've got 3 or 4 and been using them for a while with no problems. Plus they are black and you dont have to worry about painting them. I started painting mine black so they are not as noticeable, seems like if people see you fishing a marker bouy they end up fishing your spot when you move. I noticed when I started painting them black people didnt seem to notice them.