Instruct: Classify Amazon reviews into positive or negative sentiment
Query: very poor quality

This set was impossible to use: the numbers and letters were not centered or aligned with the flat sides of the stamp tool, so it was impossible to orient the character accurately on the work to be stamped. Properly designed stamps have the character centered, and aligned with a flat side (usually square) of the stamp tool. This set went into the rubbish rather than return it, so that it would not wind up in some unsuspecting purchaser's hands. One of the worst examples of poorly executed, cheap knock-offs. Caveat emptor.