Perixx PERIPRO-303 GBK 34 mm Replacement Trackball Glossy Black Speed Type Replacement Ball for PERIMICE-517/717/520/720 Compatible with Logitech/M575/M570 The "Black" version is now available in the PERIPRO-303 series!! The PERIPRO-303 GS is a glossy, elegant black replacement ball. Diameter 34 mm / Body weight approx. 25g. 【Glossy Finish】The glossy finish of the ball allows for agile and smooth movement, increasing the sense of speed. Work efficiency is improved, and the burden of mouse operation is reduced. Suitable for gaming, large displays, and working with multiple monitors. 【Wide Compatibility】The 34mm ball is compatible with PERIMICE-517, PERIMICE-717, Logitech, Sanwa Elecom, and Kensington M570 trackball mice. *Please note that the black color may not be compatible with Elecom trackball sensors. 【Easy Removal】How to remove the PERIMICE-517/717 ball: Insert a round-tipped stick through the hole on the back of the mouse body and gently push to remove the ball. *Be careful as using pointed sticks or hard brushes may scratch the ball. Before use, wipe the ball with a soft cloth such as a glasses cloth to remove dust and excess oil, and then clean the inside of the mouse body with a soft brush or air duster before inserting. 【Official Warranty】Manufacturer: Perixx Computer GmbH ・Designed in Germany ・If any defects occur during normal use, we will repair or replace it with a new one free of charge within the warranty period.