The lens look like in the pictures. The actually fit snugly on the WS2812 leds with certain orientation. If the lens is loose, just turn it 90 degrees and it will fit. I don't see much difference on the light with the lens on vs off but I bought them as protection for the leds so that's OK. Before buying these lenses searched for difuse / milky type. With this you can still see the red, green and blue leds as separate light wich I wanted to avoid. At least the leds have protection.
Fasty shipping, good quality