These are acrylic scrubbers, convenient for cleaning. The diameter is approximately 9.5-13.5cm. They are sold as a set of 3. They can be used with just water in the kitchen, bathroom, washroom, etc., so I think they will be very useful for cleaning. I will prioritize those who purchase immediately, even during negotiations. These are handmade items, so there may be slight distortions or size differences. Please refrain from purchasing if you are looking for perfection. #handmade #acrylicscrubber