What makes the best keyboard tray? At Ergonomic Home you select from many sizes and shapes of keyboard trays, platforms for the way you work, then add the keyboard arm. Note: sold separately to allow you the ability to tailor the features your specific needs. Eco-Friendly Furniture recycled content of keyboard tray is 40%, and 90% for keyboard arm. Save money on this USA made American furniture. Plus free shipping. Online since 1997 with 40+years office furniture experience.