The inside of a conker is made of a seed or nut surrounded by a hard protective shell. The seed or nut is the part of the conker that can grow into a new tree when planted.
with a conker shell tool
yes its the nut of a horse chestnut tree.
A conker case is commonly known as a "conker" or "horse chestnut shell." It is the hard outer shell that encases the seed of the horse chestnut tree. In the context of the game played with conkers, the seed is typically removed from the shell and threaded onto a string for play.
It is the horse chestnut that produces conkers.
nut
The spiky outer shell of a conker is known as a husk. Its purpose is to deter animals from eating or damaging the seed (conker) inside. The smooth conker shells are typically found in varieties that have evolved to have a thinner, smoother husk for seed dispersal through rolling rather than dispersal by animals.
The cashew nut
Walnut is an edible nut with a smooth thin shell.
Shell.
Chestnut or as we always called them as children 'conkers' xx
A coconut.