GRIFITI Large Slim Palm Pads Notebook Wrist Rests and Laptop Wrist Pads Made with Silicone to Easily Reposition and Remove while Travelling (2 Large 4 x 3.12 inches) 2 large size 4 x 3.12 inches. Measure your palm rest areas to get the right size. Grifiti Slim Palm Pads are Apple MacBook wrist rests that are repositionable and removable. Tacky silicone base lets you stick them where you want and remove them at any time to go...stick the 2 of them together and throw them in your bag Position Grifiti Palm Pads are for use over the sharp edge on laptops for more comfort Works with Macbooks, Laptops, Notebooks, Netbooks...8cm x 10 cm and 2 mm thick comfortable, washable...soap and water then you let them air dry