Part material and UOM

Wireless and IoT RF and Wireless
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1

8863-LT20NE2182 AND 2181;
what is the difference between these two numbers
what is the unit of measure e.g. inch, feet, yard, roll, etc.

2

Hello Alancsmith,
LT20NE2181 width 2.54mm thickness 1.89 mm
LT20NE2182 width 3.38mm thickness 2.54 mm

https://www.digikey.com/en/products/filter/rfi-and-emi-shielding-and-absorbing-materials/869?s=N4IgTCBcDaIDIBUwAYByBRMBGAHCAugDQgBsUoAlgCZQgC0WyyIxADgC60sjsCerAU1oBDAM4BjEAF8pQA

Thank you