Sticks of wood (lumber). Usually they are used in stacked lumber to keep
the wood separated for air flow - and flat.

I did not mention that you would want a flat surface under the stickers.

Mike

Thank you Mike.

Three or four 2in x 2in sticks for a 36in x 48in table top?

It will be placed on a concrete slab apron in front of the garage. No cracks
or obvious defects in the slab.

Thanks.