A squib is a miniature explosive device used in a wide range of industries, from special effects to military applications. They resemble tiny sticks of dynamite, both in appearance and construction, although with considerably less explosive power. Squibs can be used for generating mechanical force, or to provide pyrotechnic effects for both film and live theatrics. Squibs can be used for shattering or propelling a variety of materials.
A squib generally consists of a small tube filled with an explosive substance, with a detonator running through the length of its core, similar to a stick of dynamite. Also similar to dynamite, the detonator can be a slow-burning fuse, or as is more common today, a wire connected to a remote electronic trigger. Squibs range in size, anywhere from 2 to 15 millimeters in diameter