1. About the ear size: these silicone ears have a transparent hollow, the middle of the black line is a memory of aluminum. The headset can be adapted to the ears' cartilage by bending them into a certain shape, thus fitting into the ears of most people. You can bend them manually or adaptively. 2. About matching the ears' surface: the silicon ears's soft and transparent hollows reduce pressure and by fitting into the most people's ears prevent hurting the ears.