Do these use c-rfm? C or f, are in printers. And in wood. And in oxygen.

Those keys are dual chip which are UID changeable with 4 byte UID and T5577 rewritable .

can i clone a mifare 1k card to it using a flipper zero??

On my fz it shows Mifare Classic 1K if I use Extra Action > Read Specific Card Type > Read Mifare Classic. Under Applications > Tools > NFC Magic > Check Magic Tag I get Classic Gen1A/B. There is then the option to wipe or write. I was able to successfully write the tag.

What color are these?

The ones I received are red, blue and yellow.

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Customised Version 1K UID Changeable & T5577 Dual Chip IC/ID Key Tag Readable Writable Rewrite for Copy Clone Backup

Product ID: 549172646

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Details

Brand
XCRFID
Color
Multicolor
Finish Type
Uncoated
Material
Acrylonitrile
Size
1 Count (Pack

Description

Customised Version 1K UID Changeable & T5577 Dual Chip IC/ID Key Tag Readable Writable Rewrite for Copy Clone Backup

Specifications

ASIN	B0828JNQ62
Best Sellers Rank	#111,930 in Office Products ( See Top 100 in Office Products ) #202 in Identification Badges
Brand	XCRFID
Color	Multicolor
Customer Reviews	4.2 4.2 out of 5 stars (65)
Date First Available	December 3, 2019
Item Weight	1.94 ounces
Item model number	XC393
Manufacturer	XCRFID
Manufacturer Part Number	XC393
Material Type	Acrylonitrile Butadiene Styrene
Number of Items	1
Product Dimensions	1.9 x 0.6 x 0.3 inches
Shape	Rectangular
Size	1 Count (Pack of 1)

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