How long do they last in the shower before being replaced??

How long they last will depend on your water system if it's filtered before it come to your shower head or not. Otherwise you will know when it's time to change filters it changes color when it get full and your shower head won't produce as much flow as before.

What micron is this? 0.2 micron? Does it have beads inside?

No beads inside. It's just pleats of cotton. If you do need these for a shower head, make sure they are the right length. Some use these 3.7" length Some use 3.5"/ 4"

ASIN	B09P9TR3VS
Best Sellers Rank	#40,381 in Home Improvement ( See Top 100 in Home Improvement ) #176 in Showerhead Filters
Brand	luzdiosa
Country of Origin	USA
Customer Reviews	4.4 out of 5 stars 1,173 Reviews
Enclosure Material	Plastic
External Testing Certification	NSF
Item Dimensions D x W x H	23D x 23W x 94H Millimeters
Item Weight	0.08 Kilograms
Manufacturer	Amwing
Material	Plastic
Model number	LZD-VORTEX-PP-COTTON-12
Product Benefits	Improves water quality for showers
Product Dimensions	23D x 23W x 94H Millimeters
Unit Count	12.0 Count

PP-Cotton Shower head Filters for Filtered Handheld Showerhead, 3.15in Set of 12 Replacement Filters for Detachable Shower Heads

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