Surgical Mask Ear Protection 3D Printed in USA Keyword(s) Ear Protector, mask, Strap Extension Colors Black, Blue and White This is a strap extension for facemasks with elastic straps that go around the ears. The purpose of this modification is to lower the amount of material used, lighten the hardware, allow more flexibility and remove an additional notch on each side for slimer faces. When you buy one, we donate one to a local hospital or clinic.