I thought stuck the rest of them back on but theyre gone. Are they needed or am i cool?

 

They are weights used to balance your wheels. Drop by your local tire shop and tell them your wheels need to be balanced. Not a big deal and can wait if you need to. You will notice a "wobble" in the wheels if they are not properly balanced. Like I said, not a big deal if you are OK with the ride.

 

Agreed....

 

Yup that looks like a wheel weight as mentioned. I'd get all four wheels balanced. Most of the time if the weight is off just a little you won't notice it. If it's off 5 grams, maybe not. If it's 10 or more, you will, especially if it's on the front.