Question

cricket bat is made up of what?

Answer 1

Some bats are made up of Kashmiri Willow and some are of English Willow.
English Willow(wood) is better than Kashmiri Willow(wood) as it is more durable and shock resistance.
For more durability some bats are made up of concrete covered with wood out side.

I hope it will help you.
Thanks

Answer 2

The bat is traditionally made from willow wood, specifically from a variety of White Willow called Cricket Bat Willow (Salix alba var. caerulea), treated with raw (unboiled) linseed oil, which has a protective function.