The Allen Company's Eliminator Window Shooting Rest is designed to fit over a window or fence rail. It features tacky grip material on bottom, rugged polyester ripstop exterior fabric & is filled with inert foam beads.
Specifications:

Description
Type of Bag	Front Bag
Prefilled-Empty
Type of Feet
Cradle Blocks
Material	Polyester
Vertical Adjustment
Lockable Position
Weight	0.17 lbs
Adaptor Type
Dimensions
Attachment Type
Yoke Type
No. of Legs
Includes