What are these?

[kalsh]

Found these it a box of parts but have no idea what model they are for or brand? Sorry can’t work out picture as took it on IPad and can’t seem to rotate it to correct orientation.

[Peter_B]

They look to be sleeves to fit over the diff out drives of Hotshot series cars.

No idea what the purpose would be though.

[MadInventor]

I think it's to stop the joint cups spreading when using powerful motors, or just to help prevent dirt ingress into the slots in the drive cups.

[Tizer]

I've had shafts move side to side in the outdrive cups before on other cars, wearing the outdrive cups out very fast. This will help prevent it. A lot of modern cars have sleeves on the diff outdrives.