All materials and accessories to be used in installation must be high quality and long-lasting. Bleachers purchased from the guaranteed place should be repaired and replaced with the team in case of a possible malfunction and problem. If you bought it from a place without a warranty and it was installed, you may have a headache. Make sure that the TSE certificate and products have a TSE stamp. If possible, make sure that the seats are non-slip and non-dirty. If you have selected a seat model that opens an