ELECOM Ergonomic Comfort Design Trackball IST Wireless 2.4GHz Connect, Super-Smooth Tracking with Roller Ball Bearing, 36mm Ball, Thumb Control, Compatible for Windows, PC, and Mac Black (M-IT11DRBK)

Specifications

• STEEL ROLLER BEARING MOUNTED TYPE - Roller Type Bearing Provides the Ultimate Feelings and Smoothness. The bearing designed by Japanese manufactrer provides friction-free ball oparation.
• INTERCHANGEABLE BEARINGS - Replaced with ELECOM bearing parts that sold separately
• ERGONOMIC DESIGN - Supports your hand in a natural angled position 28 degree for all day comfort.
• 36mm SILVER BALL SIZE - Easy to move from one end to the other even on large screens.
• Dimesion - Width 3.8 inch x Length 5.0 inch x Height 2.0 inch, Weight : 5.2oz
• *This product does not include replacement Ruby Ball bearings.