The Fidue A73 are larger than classic dual-driver earphones like the Jays q-Jays and long-discontinued Ultimate Ears 700 because they use a hybrid driver array rather than a pair of tiny balanced armatures.
There’s a balanced armature to handle the higher frequencies and a 10mm dynamic driver to fill in the lower registers.
Build and comfort
At first glance the Fidue A73’s swooping earpiece design looks like it’s made of plastic, but it’s actually cast in aluminium. The outer part is metal, the half that points towards your face plastic.It’s translucent red plastic, to give you a look at what’s going on inside.
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https://www.whathifi.com/fidue/a73/review
