For Bracers for roleplaying or just looking cool heres what you need.
1 Empty Water Bottle(16.9FL. OZ)
2 Duck Tape(Chrome looks best IMO)
3 Strong Scissors
4 Paper Towels
5 Sanding Block or Sanding Paper
6 Something to Crease into the lines of the bottle(Opt)
7 Sharp knife(i used and Ex-acto Knife for cutting tape) Opt
Step 1: Cutting the bottle
Cut the bottle at the top removing the area where it starts to slope and the bottom and then down the the side so it opens up.