- 2" x 10" anodized aluminum seat planks (no discoloring)- 1 - 2" x 10" aluminum foot plank on all rows- Color options available on select models- 5 YEAR GUARANTEE - Against defective materials and workmanship. Our Bleachers are built to the highest standards in the industry- All Alumagoal Bleachers conform to NFPA and CPSC requirements for safety and design- FRAMES - 100% all welded, all aluminum angle construction- SEAT PLANKS - 10" wide, minimum wall thickness of .085", ribbed no-slip surface, anodized aluminum which prevents discoloring that can rub off on uniforms or clothing- FOOT PLANKS - 10" wide, minimum wall thickness of .085", ribbed no-slip surface, mill finish aluminum- FRONT ROW HEIGHT - 3 row bleachers front row is 16" and rise in 6" increments. 4, 5, 8 & 10 row bleachers front row is 17" and rise in 8" increments.NOTE:Before ordering 4 or 5 row bleachers, check your local ordinances regarding safety fencing requirements and specifications. All Alumagoal Bleachers conform to NFPA and CPSC requirements for safety and design