These are 1.44" x 1.24" x .24" arc-shaped magnets. Look carefully at
those measurements! Magnets this large would make for very interesting
experiments or science demos. However, if you don't know how to handle
them, they are an accident waiting to happen. Also, you might encounter
trouble trying to ship them (USPO won't ship big magnets, but UPS might
consider it.)
Note that the instigator at http://www.wondermagnet.com/dev/magnets.html
is a small "magnet recycler" company which disassembles all sorts of
motors, diskdrives, etc., and sells inexpensive surplus NIB magnets for
educators and experimenters.