sentences:  The keel was cast lead with a small "stubby" of fiberglass, and the rudder was a fiberglass and foam sandwich with a pultruded fiberglass shaft.Unlike many of the boats built in Santa Cruz, the Olson 30 had a light spruce plywood interior, in contrast to the more common Bruynzeel plywood interiors of other boats.Approximately 250 boats were built by Pacific Boats and Ericson Yachts.