IP68 rated washable 25mm stainless steel optical trackball MODULE 800 DPI resolutions. MAIN FEATURE Emulates most ... . Available 50mm, 40mm, 38mm, 25mm, 22mm, 19mm and 16mm diameter stainless steel or hard phenolic resin ball for smooth, durable operation and ... boxes to a standard export carton. IP68 rated washable 25mm stainless steel optical trackball Mouse