Logitech G on Twitter: "In 2014, we launched the G502 Proteus Core, which became the first in a line that grew to be the best selling gaming mouse on the market. #UltimateCountdown
Refurbished: Logitech Recertified 910-004074 G502 Proteus Core Tunable Gaming Mouse with Fully Customizable Surface, Weight and Balance Tuning - Newegg.com
Amazon.com: Logitech G502 Proteus Core Tunable Gaming Mouse with Fully Customizable Surface, Weight and Balance Tuning (Renewed) [Video Game] : Video Games
Amazon.com: Logitech G502 Proteus Core Tunable Gaming Mouse, 12,000 DPI On-The-Fly DPI Shifting, Personalized Weight and Balance Tuning with (5) 3.6g Weights, 11 Programmable Buttons, Fully Customizable Surface : Video Games