Original - 1.78 x .5 in (45 x 13 mm) with three strong earth magnets on back
HD - 2.125 x .5625"" (54 x 14.5 mm) with three very strong earth magnets on back
Magnum - 3.98” x .59” (101 x 15 mm) each with five stronger earth magnets on back

Made of: Plastic and Metal

Use: Magnetic Sewing pins

Included: 3 magnets per package