Composite material reinforcement materials. Another important factor is the gross quantity of material to be produced. Large quantities can be used to justify high capital expenditures for rapid and automated manufacturing technology. Small production quantities are accommodated with lower capital expenditures but higher labour and tooling costs at a correspondingly slower rate. Many commercially produced composites use a polymer matrix material often called a resin solution. There are many different polymers available depending upon the starting raw ingredients. There are several broad categories, each with numerous variations. The most common are known as polyester, vinyl ester, epoxy, phenolic, polyimide, polyamide, polypropylene, PEEK,
Sometimes I Sit and Think, and Sometimes I Just Sit are confessional, only they describe her material life and conflicted feelings acutely rather than dreamily, so that the songs occur in and are inflected by a deftly rendered physical and social world." In a less enthusiastic review, Christopher Monk of musicOMH called "Sometimes I Sit and Think, and Sometimes I Just Sit" "a likeable, enjoyable album rather than a great one", writing that "the craft of Barnett's words dwarfs that of her music...there are too many compositions here that feel underwritten." "Rolling Stone" ranked "Pedestrian at Best" at number 4 on its annual year-end list to find the best songs