The M18A1 Claymore mine has a horizontally convex gray-green plastic case (inert training versions are light blue or green with a light blue band).
The shape was developed through experimentation to deliver the optimum distribution of fragments at 50 m (55 yd) range.
The case has the words “FRONT TOWARD ENEMY” embossed
on the front of the mine.
A simple open sight on the top surface allows for aiming the mine. Two pairs of scissor legs attached to the bottom support the mine and allow it to be aimed vertically.
On both sides of the sight are fuse wells set at 45 degrees.
Internally the mine contains a layer of C-4 explosive behind a matrix of about seven hundred 1⁄8-inch-diameter (3.2 mm) steel balls set into an epoxy resin.