If a micro SD card can't fit into the quarter then what type of media is sitting in the quarter in the example photo?

See the micro SD card in the photo does fit into the coin length and width wise but as far as depth it does not it is too thick what i did was hollow the coin out a little more with a drill press honestly your best bet if your trying to conceal something would be to spend the extra few bucks and get the half dollar one instead my main motivation for getting the coin was for the collector value due too my Soviet era spy collection im starton

Brand	Xeuknn
Product Dimensions	1"D x 3"W x 3"H
Lock Type	Key
Color	US Quarter
Capacity	1 Cubic Inches
Material	Metal
Special Feature	Portable
Included Components	US Quarter
Water Resistance Level	Not Water Resistant
Chamber Depth	3 Inches
UPC	845761945289 764895462151 879648851363 821345615281
Series	US Quarter
Item model number	COVERTCOINT25CUS
Item Weight	0.317 ounces
Item Dimensions LxWxH	3 x 1 x 3 inches
Manufacturer	CCS Spy Gear
ASIN	B0036VJHXG
Is Discontinued By Manufacturer	No
Date First Available	February 2, 2010

US Mint Quarter - Micro SD Card Covert Coin - Secret Compartment US Quarter

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