Blue Wool Stairs is a stair-shaped block crafted from wool, one of sixteen color variants that share the same shape and behaviour. It is made from six blocks of wool of the matching color arranged in a stair pattern on a crafting table, yielding four stairs at a time. Like other stairs, Blue Wool Stairs can face any direction, be placed right-side up or upside down, form straight or corner shapes, and hold water when waterlogged.
Blue Wool Stairs is easy to break with any tool, though shears cut through it fastest, and its low blast resistance and high flammability mean it ignites quickly near fire or lava. Any wool stairs can be redyed to a different color with a dye. In Java Edition, Blue Wool Stairs can also be burned as furnace fuel.
Beyond decoration, Blue Wool Stairs is useful for redirecting sound: placing it between a sculk sensor or sculk shrieker and a vibration source blocks that vibration from being detected, and it can likewise stop note block sounds from reaching nearby allays.