Are these airtight on a 1 gallon glass carboy?

Only if your carboy is a 38mm / 400 opening

What is the inside and outside dimensions in inches of the lid?

What you need are the INSIDE of the LIDS and the OUTSIDE of the JUGS. The lids are 38mm INSIDE just as stated in the ad. Now measure your Jugs OUTSIDE and see if it matches/ Measuring the outside of the lid is like measuring the outside of a shoe - why do it? Your foot goes inside the shoe right? Have a pleasant Holiday Ron HD

What is the material lining the inside of the caps?

It looks like some sort of Styrofoam. It doesn't cover the whole cap only around where the edge of the bottle sits on the cap.

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White Metal Growler Caps 38mm Fits Most 1/2 and 1 Gallon Jugs (12)

Product ID: 54135308

Details

Bottle type
Beer Bottle
Brand
FastRack
Capacity
1 gallons
Colour
White
Material
Metal

🔩38mm universal fit

🛡️Secure airtight seal

🇺🇸Made in USA quality

Description

🍺 Seal your craft, savor the moment!

AIRTIGHT SEAL - Keeps homemade wine and beer fresh with a tight, reliable closure
BULK PACK OF 12 - Stock up and never run out with a convenient dozen-pack
MADE IN THE USA - Crafted domestically for trusted quality and performance
PERFECT 38 MM FIT - Seamlessly fits most 1/2 and 1 gallon growlers for versatile use
DURABLE METAL CONSTRUCTION - Robust white metal caps built to last and protect your brews

These White Metal Growler Caps measure 38mm and fit most half-gallon and one-gallon glass jugs, providing a durable, airtight seal ideal for homemade wine and beer. Made in the USA, the pack of 12 offers a reliable, cost-effective solution for home brewers seeking a hassle-free alternative to corking.

Specifications

ASIN	B00S1UJ2Y6
Bottle Type	Beer Bottle
Brand	FastRack
Capacity	1 gallons
Colour	White
Customer Reviews	4.5 4.5 out of 5 stars (633)
Global Trade Identification Number	00742436713726
Included Components	12 Metal Caps
Item Weight	50 g
Manufacturer	Home Brew Ohio
Material	Metal
Model Number	75012WT
Number of Items	12
Part Number	4330AX 12
Recommended Uses For Product	For beer storage and transportation
Shape	Round
UPC	642125537742 628504293225 742436713726 628504293188 055848000170
Unit Count	12 Growler Cap

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