Positive and negative side. Each ball has a drilled hole through which a rope runs and a knot tied on each side of each ball. I assume that it will be very difficult to properly clear the path to the middle of the ball. The plain box came with a small label with the contents printed on it, so privacy wasn't a big deal. The set included a black satin pouch and two extra ties. The metal tongue is a little rough around the edges. Instead, you can attach one of the spare strings and it's fine, or putting in without a string works just fine if you're comfortable. I weighed them in at just 238 grams (including the attached cord and metal tongue). They are just over an inch wide so the 30mm in the description is correct. The size/diameter would be IMO, good for a beginner. Using both at the same time is probably for the more experienced athlete due to the weight. If I can figure out how to properly clean center holes they get 5 stars and are happy to come back with that information and edit their review.
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