The Icelandic Cob has a hardwood plugged, filled, compact bowl.  It features a nickel ferrule and 6mm filtered Italian Acrylic Bit.

6 mm Filter

Approximate Dimensions

     Length:   5.53 in / 140.6 mm

     Bowl Height:   1.9 in / 48.27 mm

     Chamber Diameter:   .581 in / 14.75 mm

     Chamber Depth:   1.44 in / 36.77 mm