This is a safe ninja star that wont put holes in your wall but WILL be fun to throw. All you need is a few simple tools/supplies.

~|~Cardboard/Shoe Box/Soda Box/Thick or thin cardboard/ect.
~|~Scissors or something sharp to cut with.
~|~Tape: Gaffer tape or the tape that looks like metal. Duct Tape(the clear stuff) And optonal but useful, just Scotch Tape.
~|~Sharpie
Once you have these, take a look at the next step!

Step 1: Step 1: the Tracing

OK know your design, then draw it on the cardboard and another right next to it. Another more efficient way is make a oragami Shuriken and trace that. What ever works for you.

Then go on to Step 2

Step 2: Step 3: Cut and Tape

OK then you cut the two shuriken shapes from the cardboard.
After, tape them together with packing tape, make an X in between the points.(in the picture, the X means the tape) After u do that a few times, smear your finger on the edge of it to make it shaped.

GO ON TO STEP 3

Step 3: Step 3: More Taping

Yea, Yea, more tapeing, but all you do is, tape it like before, over the masking tape, But do it a lot.
see photo 2
(the grey is the tape, brown is still cardboard)

After, tape the corners. Its a little different than just "mummifing" it. This time you put the tape DIAGNAL on the corner, then wrap it like present.
See photo 1

The just tape it over the wrapping lines.

Step 4: Last Step

If you want it to be heavyer, just repeat step 3. Tape it up some more, BUT I MUST WARN YOU IF YOU PUT TOO MUCH IT WILL TURN INTO A SQUARE WITH POINTS< so dont put too much tape.

HAVE FUN, AND BE SAFE!