From Muchmore Racing:
Weight putty is a product for precise setting of vehicle weight balance.
There is a special case, so you can store it in the case when not in use.
Remove as many as you like and attach to the vehicle.
It is a small but heavy putty.
It is a putty type, it has the advantage of being able to stick it in various places.
Before use, wipe the part to be pasted with a cleaner.
Please use attach to a metal or plastic parts.
If you stick it directly on the carbon chassis, it may fall off.
Please use it by attaching it to the surrounding parts.
Great for bumpers or where fine settings are required.