16.4Ft/5M Silicone LED Cover, Alumium Profile Silicone Channel Diffuser Flexible PC Lampshade Line for Strip Lights, Ceiling Lamp, Under Cabinet Cover Replaceable Installation (10mm)

One example of many: https://www.amazon.com/KSDLMPA-Silicone-Lampshade-Replaceable-Installation/dp/B0DWXKWP7T If fixed in place, there are also aluminum channels with diffuser covers.