WANTED: Wood suitable for strong shelves (Stroud GL10)

Wood suitable for strong shelves
WANTED
Wood suitable for strong shelves
Stroud GL10
DESCRIPTION
Hi just seeing if anyone has some plywood or hardwood. Need to make some large shelves around 55/60cm x 80cm Looking for some plywood / strong wood, 18mm to 24mm thick so it stirdy enough to take the load will be putting on shelfs. Many thanks