Alright product if you want to test the waters.
Brought these geisha balls as a step into the market to find out if I liked them or not and they served their purpose. They're a good weight for a beginner and I had no issues with short term wear. However, they're no good for wearing all day as the silicon covering bubbled on both balls. This could just be a flaw with the ones I brought but if you are after something to use all day I would suggest metal or glass.
For me, they served their purpose, but I will be in the market for something which is a bit more long lasting. For what you pay, if you are after a casual toy, this product would do the job.