OK - Possibly the best place to get further info is from the Lighthouse web-site (from the horses mouth).
Quadrum capsules are made by Lightouse.
Lighthouse products are generally amongst the better quality, as they specialize in collecting supplies.
Quadrum capsules were designed in the the 2x2 format (2 inches x 2 inches, or 50mm x 50mm), popular with cardboard holders. This then makes them compatible with most storage / presentation solutions designed for 2x2 holders.
In saying that, they are thicker than cardboard holders, so will not fit in to pages made for 2x2 holders.
You can get quadrum specific pages for some lighthouse albums.
The foam insert is chemically inert, so as not to react with the metal in your coin.
The capsules themselves are pretty easy to take apart and put back together.
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