This is a pack of ten ProTek R/C 5x11.5x0.2mm Differential Gear Washers. These washers have a 5mm inner diameter, with a 11mm outer diameter and are 0.2mm thick. These can be used in a variety of applications, but are intended to be used as differential washers.
Note: This list may not be 100% accurate or up to date, and is meant to be used as a guideline for compatibility.