Step 1: Materials
1. A length of 1mm gauge piano-wire. I stumbled on this in a hardware store but it's also available from most hobby stores. It is sold in 1-metre lengths and ranges from 0.3mm to 5mm (yep, I made a slingshot with 5mm piano-wire too!). In this instructable, you'll be working with a length of 360mm.
2. Rubber bands. Use however many you like and whatever thickness you like. As I mention in the video, I prefer to twist several ordinary rubber bands into a kind of bungee-style cord. This makes for a much safer slingshot (for the user, not the target) and reduces the risk of a whole band snapping and hitting you in the face.
3. Slingshot handle. 100mm length of dowel (10mm diameter) or rod (10x10mm).
4. Handle binding. Cord or tape is needed to bind the slingshot frame to the handle. After using electrical tape, I finished my handle with black heatshrink (also found in hobby and electronics stores).
5. Ammo pouch. This can be made from any soft pliable fabric. I used a short length of ordinary shoelace for mine, because it's readily available, easy to work with, strong and soft.
Step 2: Tools:
1. Eye protection and safety gloves.
2. Small bolt-cutters or other heavy-duty wire-cutters. Piano-wire is extremely tough to cut and bend.
WARNING - cutting high-tensile materials like piano-wire is dangerous. Be aware that pieces of wire can fly off when cut. Do this in a safe environment away from people and pets. Secure the pieces you are cutting to keep them flying away.
3. Pliers for bending the wire. A bench vice is helpful here too.
4. Small tenon saw. This is for cutting the grooves in the handle as you'll see in the video.
5. Electrical tape, cord, twine or heatshrink - to bind the frame into the handle.