This is a knex shield but it is not bullet proof sorry but it is really strong and it can strap on you wrist.
Step 1: Gather the materials.
Rods: 2 Yellow, 4 Blue, 28 White, 44 Small Green (or black)
Connectors: 7 Red, 7 Yellow, 6 Orange (or black) 8 Gray, 2 Light Tan (or like a mud color) 14 White circles, 2 Green.
Step 2: Construct Sheild Part (the part that protects you)
This pic should help you build it nothing can get through unless they attack you with their pinky.
Step 3: Make Wrist Strap.
These go on back i will show you where to put them.
Step 4: Adjusting the Strapts.
This is how you put it on and tighten the straps.
Step 5: Finish Project.
This is how it should when you done have fun. (ignore those gray pieces i just put them on for no reason)