Replacment clip for the shoulder straps of Frogs and some Cameleon 1's it has no "lift guard" an internal "wall" that stops excessive movement of the clip once clipped on to the waist clip loop. It requies no sewing to fit. Use a small screwdriver to break off the plastic ring that holds the broken swivel clip, pull broken clip out of holder, fit new plastic ring with the chamfered edge facing downward, push new clip up unto the new plastic ring.
Check you clip against the 3D image to make sure you have the right clip Bugaboo changed the style/ size of the "lift guard" inside the clip. I have three versions of the Bugaboo Shoulder Clips on Shapeways so the one you need will be here.