They seem to be very poorly finished. Most of the material of the strap seems good, but the pins are loose and the buckle is made of very thin and brittle plastic. One arrived scratched. They aren't worth the money. I haven't had them long but I don't expect them to last long.
πΆοΈ Flows: Polarized Bluetooth Audio Sunglasses with Open-Ear Speakers - High Sound Quality, Long Battery Life, UVA & UVB Protection - Bruno Style (Slate Gray)
4 Review
πΆοΈ Bose Frames: Black Audio Sunglasses with Bluetooth Connectivity and Open Ear Headphones
3 Review
πΆοΈ GELETE Bluetooth Sunglasses: Music, Calls & Polarized Lenses for Men & Women
3 Review
πΉοΈ HTC Vive Tracker 3 Pack (2018) for Virtual Reality Headset
3 Review