This set of grenadilla wood tenon caps fit over the tenons of your English horn. They protect the cork from lint, and the case from cork grease.
They also ensure that the joints of the instrument rest snugly within the case for a more secure fit. The end of each cap is open allowing air to circulate through the joint avoiding buildup of unwanted moisture.
These caps fit many different English horns.
The dimensions of these caps are:
Upper joint cap: 20mm inner width, 27mm total cap height
Lower joint cap: 26mm inner width, 21mm total cap height