These are Body Clip Retainers from Dubro.
These work with electric or nitro vehicles. This includes two retainers (one for front and one for rear) and eight body clips.
Includes: Two black retainers, Eight body clips, Instructions
Comments: The body clips are attached to the black strap. The strap mounts to the the hood of the vehicle. This is so when you remove the body clips you won't lose the clips.