[Ultra Lightweight and Compatible for Small Ear] The surface and Angle of A1 earbuds in-ear part have been polished and refined repeatedly to achieve a balance between beauty and comfort and make it comfortable to wear. Likewise, a single earbud weighs only 3.7g, making it as light as a feather and discreet in the ear. Ergonomic design provides a comfortable and secure fit that doesn’t protrude from your ears especially for sports, workout, gym.