Dicke RUNR48-200 Solid Vinyl Roll-Up Sign, 48" x 48" - "Flagger Ahead"Dicke non reflective roll up vinyl traffic sign offers full size signage in a lightweight and easy to store design. Fiberglass ribs (cross bracing) feature a protective veil to prevent blooming and painful splinters. Rib set is fastened at the center with a 1 4" steel rivet and spring washer providing constant tension; will not loosen or tighten with use the way nut and bolt assemblies do. Corner pockets are made of tough polycarbonate plastic for