Part 1 of 3: vs TT sponge thickness - Physical properties and quality control issues?

This is the first in a three part series looking at the difference in performance between 2.2 and 2mm table tennis sponge thickness on the same make/model of table tennis topsheet - using Giant Dragon Maxspin. In this video we concentrate on the physical differences between two sheets of the same table tennis rubber but in 2 and sponge thickness and discover some unexpected variaions in what should be the same top sheet. In particular we look at dome / curl, top sheet, sponge elasticity, grip, tac