... corners and blades Flat surface for safety Floor Register,Air Register,ventilation register Model No.DescriptionMaterialPKProduct sizemm)CBMW.tRF31003B3" x 10 ... 774RF31028B3" x 10" Plastic Floor Register,TaupePP20282104380.024983.02RF31036B3" x 10" Plastic Floor Register,BrownPP20282104380.024983.68RF41003B4" x 10" ... .The step is as following : Plastic floor register,air register,ventilation register