As a new buyer i am impressed with the quality and precision of these blocks. Based on my observations, they're hard and durable, ensuring accurate measurements every time .The blocks are perfect for use in the industrial and scientific fields, and their versatility is unmatched. One pros is their ability to withstand wear and tear, making them a smart investment. The only con is that the blocks could be a bit pricier compared to similar products on the market. Overall, I would highly recommend See full review