1/8" diameter rod magnet 1/8" long

http://www.rare-earth-magnets.com/detail-ID-100.html

From CH ignitions

41. Magnet, alinco nickle 5, 3/16 X 3/8 .................................................. ................................. $1.50
42. Magnet, selenium cobalt 8, 1/8 X 1/4 .................................................. .............................. $2.50