Professional-grade foam expansion joint material designed for creating flexible expansion joints in concrete slabs, driveways, and sidewalks. Manufactured by NOMACO with Fastflex construction and convenient tear strip feature for easy installation. The 1/2" x 3-1/2" x 50 linear feet dimensions provide substantial coverage for thinner residential concrete applications while the compressible foam absorbs expansion and contraction movement, preventing cracking and damage in concrete structures subjected to temperature changes and seasonal movement.