Carbon fiber reinforced polymer as epoxy, but other thermoset or thermoplastic polymers, such as polyester, vinyl ester, or nylon, are sometimes used. The composite material may contain aramid (e.g. Kevlar, Twaron), ultra-high-molecular-weight polyethylene (UHMWPE), aluminium, or glass fibers in addition to carbon fibers. The properties of the final CFRP product can also be affected by the type of additives introduced to the binding matrix (resin). The most common additive is silica, but other additives such as rubber and carbon nanotubes can be used. The material is also referred to as "graphite-reinforced polymer" or "graphite fiber-reinforced polymer" ("GFRP" is less common, as it clashes with
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