Mold Straps (also known as banding straps or mold belts) are used for holding plaster casting molds together. These are made of a heavy duty polyester webbing and rust resistant metal buckle. Mold Straps are stronger and longer lasting than rubber bands and prevent leaking with their tight binding.
Available in a variety of sizes including:
Mold straps are easy to strap on and take off. Below is an instruction how to video that demonstrates how to attach a strap to a mold.