Jobmate Black Forearm Support Advance (MPN 505408) is a desk-mounted rest that supports the full forearm while you work at a computer. Its asymmetrical shape is designed to sit alongside ergonomic mice such as Mousetrapper, Jobmate and Rollermouse. It can also support your arm while using a keyboard or numeric keypad.
Adjustable mounting allows attachment to straight or angled desk surfaces. The datasheet lists dimensions of 665 × 210 × 20 mm and a waist width of 60 mm. It names steel, MDF, foam rubber and Lycra among the materials. A retailer listing describes a PU leather surface, PU foam padding, PET felt, metal and polyamide, and gives a different thickness of 23 mm.
For cleaning, the datasheet recommends wiping the surface with a damp cloth and mild cleaning agent. This broad rest is intended for desk-based mouse and keyboard work when you want support along the forearm.