Acrylic Jointers Ideal for work with glass block, MARSHALLTOWN's Acrylic Jointer won't mark or discolor white mortar. The hardened acrylic material allows the product to be durable and lightweight. A Jointer with this quality is reliable for all of your needs. This product is Made in the USA with Global Materials. Shaped from hardened acrylic material Will not mark or discolor mortar Have a durable and lightweight tool Made in the USA with Global Materials