Made with of Genuine Extru-Lite™ magnesium which is 30% lighter than similar aluminum screeds. Quality material won't rust extending the life and use of tool. This screed are built for strength and rigidity, but lightweight enough for the largest of jobs. The 8' screed is easy to move along forms on large slab projects. The 1" x 4" size is comfortable to hold while hand screeding. Thicker walls make up the 1" side of the screed to meet our uncompromising standards in holding its shape.