One of the greatest innovations of the industrial revolution was the creation of interchangeable parts. Now Zenni brings this innovation to eyeglasses, with three frame models – 2928, 6737, and 6738 – which all come with three sets of interchangeable temple arms. With black plastic connection points at the hinges on the front rims, you can easily remove or attach all of the temple arms to all of the eyeglasses’ front rims, so you can mix and match the temple arms on each of these pairs of glasses. 292821 is a black, full-rim, curved rectangular, medium-width, flexible plastic eyeglasses frame. It comes with three sets of temple arms, in white, red, and black. 6737 is a half-rim, oval, medium-width eyeglasses frame with shiny stainless steel front rims. It comes in muted, metallic dark red (673718) or muted, metallic pink (673719). We change it up a bit with 6738, a half-rim, rectangular, medium-narrow, stainless steel eyeglasses frame that comes in shiny metallic brown (673815) or shiny metallic black (673821), with flexible plastic arms in brown, black, and blue. To remove a temple arm, press the little recessed box on the inside of the black plastic connector hinge with the thumb of one hand, and with the other hand pull the temple arm out. Then slide another temple arm in. You’ll hear it connect with a satisfying little snap.