The best solution for preventing RSI caused by your mouse is to buy a mouse pad with gel support. This Sandberg pad is made of gel that moulds itself under your wrists whilst providing firm support. Perfect relief for your wrists.
Sandberg Gel Mousepad with Wrist Rest
Sandberg Gel Mousepad with Wrist Rest. Color of product: Black. Width: 0.866" (22 mm), Depth: 1.01" (25.6 mm), Thickness: 0.0709" (1.8 mm)