Thank you for viewing. I often created diagrams in Excel and PowerPoint, so fine adjustments were difficult, and I gave up before getting used to the operation. My hands aren't that big, but the fit and the rolling feel of the ball are very good. ◆ Model Name: ERGO575S ◆ Brand: logicool ◆ Color: Black ◆ Operation confirmed before listing. ◆ No box. 　 Will be shipped in the case of another model shown in the photo. Please consider purchasing after understanding that this is a used item. Please refrain from purchasing if you are sensitive to the condition.