The mark consists of the wording "ESTRO" above the wording "BLOCK". The letters are black with white outline. Behind the word "ESTRO" is yellow shading. Running between the words is a green curved line followed by a white curved line with another green curved line beneath it. Behind the word "BLOCK" is blue shading.
Design plus words, letters, and/or numbers
The color(s) black, white, yellow, green and blue is/are claimed as a feature of the mark.
Globes, other , More than one drop including teardrops or raindrops, Coal, Bands, curved