Does uv400 block UVA and UVB?

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Tags

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2. #wavelengths
3. #protection
4. #labeled
5. #percent
6. #blocks
7. #light
8. #built
9. #uv400
10. #sunglasses
11. #including
12. #disappear
13. #rating
14. #blocked
15. #investing
16. #nanometers