This item was received along with a radio-controlled car I got from an acquaintance a long time ago. I have no idea what parts these are or what the circuit board is for. If you know what they are, or if you're interested, or if you need parts, how about it? *Everything in the first photo is included. *The aluminum ruler is not included. The main contents are as follows: ● Circuit board: 1 ● Spare tires: 2 ● Various greases (all opened and partially used) ● Stickers, plates ● Radio-controlled car parts I don't know if the circuit board works, and the parts may be incomplete, so please consider them as junk items. Thank you.