This is a knex breastplate/chestshield. Its very strong I tested it with my knex gun that had 6 rubberbands on it .You can make it bigger if you want. This is also my first Instructable but say what you want about it.

Step 1: The Shield

make this,simple right

pic 1: what you make
pic 2: a closer view

Step 2: Top Strap

now your making one of the straps

pic 1: make these
pic 2: make this to(there's 23 hinge things you can take some away or add more if you want)
pic 3: connect on top like this
pic 4:connect on top on other side like this

Step 3: Bottom Strap

now your making the second strap

pic 1: make
pic 2: attach like this on each side

Step 4: How to Put On

heres how to put it on

pic 1: unatach somewhere on the top strap put around neck and connect again
pic 2: unatach on one side of bottom strap put around back and connect again