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.
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.
testicle