Great guards, but the price is only for 1, not 4. So you have to buy 4 at checkout. I recommend that you buy more than 4 for extra replacements. If you're going fast enough the guards will break, but thankfully they will save arm tips from being shaved off after hitting something hard like pavement or gravel. I don't recommend the white one unless you want to polish out grass and dirt stains after your first flight with these. Also, if you have the standard 6mm bolts, you will need to replace them with 8mm bolts otherwise the threads won't reach the motor when mounting.