The 'Folding' in Ray-Ban 4105 Folding Wayfarer refers to a second hinge partway down the arm, not just the one at the front — and both need to line up for the temple to fold flat. This aftermarket pair is cut to the 4105's 140mm length and square-front plastic spec, with that mid-arm hinge in the right place.

A folding temple has twice the moving hardware of a standard one, so it has twice the opportunities for a hinge to loosen or a pin to work its way out — usually at the mid-arm joint before the main one at the front. If the arm won't stay folded or feels loose partway along its length, that mid-hinge is the likely cause, and it's a reason to replace the arm rather than try to tighten a worn-out pivot.

Frequently asked questions

Can I replace just one arm, or do I have to buy both?

You can order a single side if only one arm on your 4105 is broken or scratched, or buy the pair if both need replacing — either way they match the 140mm length exactly.

Is it worth buying new arms instead of a whole new frame?

Replacing both arms on the 4105 costs from €26.95 with free worldwide shipping, far less than a new frame, and it's backed by a 3-year warranty against manufacturing defects on the 140mm hardware itself.

What material are the arms made from, and will the color match my frame?

The arms are molded in an acetate or metal finish that matches the Square style of the 4105 closely, though very slight shade variation is possible since they're independently produced as separate aftermarket parts rather than cut from the same batch as the frame.

Are these official Ray-Ban replacement parts?

These are compatible aftermarket arms, independently produced to match the 4105's hinge and 140mm length. They aren't manufactured or supplied by Ray-Ban, just built to the same measurements so they attach correctly.