You are looking at the Canon EF 24-105 F/4L USM MK1 lens.  The lens is missing the red ring as it has fallen off.  The lens is otherwise very clean and works great.  

Additional accessories:

-The OEM hood

-The OEM lens cap

-B&W 77mm Haze filter with box - great shape

-B&W 77mm polarizing filter with box - box has a few cracks in it but works fine

Thanks for looking.