Window Close Icon - PNG Format.

256 x 256
Window close icon 256x256Download
128 x 128
Window close icon 128x128Download
64 x 64
Window close icon 64x64Download
48 x 48
Window close icon 48x48Download

32 x 32
Window close icon 32x32Download
16 x 16
Window close icon 16x16Download

More icons from the Actions icon set: