Israeli rubber bullets are produced in two main types. The older type, the standard rubber bullet, is a steel sphere coated in a thin layer of rubber, weighing 14 grams, while the newly improved rubber bullet, introduced in 1989, is a rubber-coated metal cylinder 1.7 cm in diameter, weighing 15.4 grams.[18] Of the lethal injuries from this projectile, most are suffered to the head.[18]

The bullet flying out my Colt .45 is 15 grams. This is that, covered in thin rubber.