Ensure the longevity of your sealed units with our Silicone 1-1/8" Wide x 4" Long Setting Block. At 1/4" thick, these blocks are designed not to react with silicone or urethane, protecting your warranty. Available in black and mint green, they offer durability with a hardness of approximately 80 durometer. Safeguard your investment and enjoy peace of mind with these essential setting blocks.