Avoid at all costs. They have the durability of holiday balloons. They burst very easily and vomit a white-grey, mysterious mucus. These are not hard silicone or rubber balls. Most disturbing is the composition of the mysterious slime. Even if it's completely inert and harmless, it will spill the contents and make a mess. Don't even consider buying if children or pets have access to the contents and may choke or choke on them. It's amazing that something like this made it onto the Revane market. The only product I would rate lower is Mainway's Bag O'Glass.
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