3/32 inch (2 mm) diameter, Chinese made, uncoated, fuse. You use Falling Leaves fuses by cutting them in short pieces, 1 to 1.5 inches long, and use in place of stars inside aerial fireworks or mines. Once ignited, they slowly fall like lazy, white/silver colored stars, simulating "falling leaves" stars. Quick, easy, inexpensive alternative to making white strobe stars. Burns at about 4.5 seconds per inch. 100 foot roll.