These bags are designed for use on mechanical rests. These owl ear front bag comes in three different sizes. Choose the size that will most closely fit your particular forend width. Ear-to-ear dimensions 1-1/2" to 1-3/4" forend. Overall dimensions of the bag are 2-1/4" wide by 5-3/4" long and 1" high in the center. The bottom is leather for stability and there is no rib on top. Note: Sand is required to fill these bags. Mfg: Protektor