Premium Blue Blocks Protect Your Customer's Furniture AND Yourself! Blue Blocks are the very best, especially for the heaviest furniture. These 2" x 2" x 1" blocks have the highest compressive strength available and will never crush. This premium block will never leave a mess as it always snaps off cleanly. The best block money can buy! 1008 per case. What's the difference between White Blocks and Blue Blocks?