These Maxell UDXL reels don't come up often and most times are

1984 Tape Recording Guide, PDF

The Maxell Cassette Tape Collection

Audiochrome: Cassette tape measurements: Maxell UD-XL, UD-XLI, XLI

The Maxell Cassette Tape Collection

Scored a lot of 200 cassettes, all type ii, with paperwork of what's on

Newbie question about types of tape. : r/ReelToReel

Audiochrome: Cassette tape measurements: Maxell UD-XL, UD-XLI, XLI

Tape Problems

People still use a cassette. Why? - Quora

The journeys of a vintage audio geek (Netherlands)

The Maxell Reel to Reel Tape Reference Guide, Page 4

Maxell UDXL / XL1 High Output Extended Range Tape - Reel to Reel

How many of you classic rock fans still use these? : r/ClassicRock

Otari MX-5050 Review (Reel to Reel Tape Deck), Page 4