When designing and building a blade, choosing the right blend of materials, glues, timber species and manufacturing variables is absolutely vital:

With a few key exceptions, over 90% of the world's table tennis blades and bats are made of highly-engineered multi-species plywood. 

While most of the world's plywood is typically constructed from a single species of timber, table tennis blades are a notable exception to the rule, and may contain anywhere from three to five different species of wood or more.

Often the various species of exotic timbers used within a multi-ply blade will originate from vastly different geographical areas of the globe, with each individual species featuring a range of differing and desireable physical properties.. 

BEfore being assembled, each layer of wood in a blade must first be cut, treated and sanded (often via a variety of different methods,) then further reduced in size, making up a range of different thicknesses.

During the lay-up (ie: the assembly process) each individual layer of engineered timber will first has its timber grain oriented in a very particular direction relative to each other layer of material in the blade. This process goes a long way towards determining the ultimate playing feel.

Each engineered wood layer is then placed on top of each other in a very specific order, frequently interspaced with various layers of stiffening composite material such as carbon fibre or kevlar (increasingly, these synthetic composite fibres are being replaced with more natural and biodegradable alternatives... but more on this later)

Each layer of the wood and fabric sandwich is then individually coated with glue (or sometimes multiple different glues) that also have particular physical properties of their own. The whole panel is then finally pressed, cured and dried, cured for a pre-determined time, at pre-determined pressure, and often at a pre-determined temperature.