Question: What does the Grain company manufacture using Northern White Cedar and Western Red Cedar wood?

Context paragraphs:
Thuja plicata: Thuja plicata, commonly called western or Pacific redcedar, giant or western arborvitae, giant cedar, or shinglewood, is a species of "Thuja", an evergreen coniferous tree in the cypress family Cupressaceae native to western North America.  It is not a true cedar of the genus "Cedrus".

Didymascella thujina: Didymascella thujina is an ascomycete fungus in the family Helotiaceae.  "D. thujina" causes cedar leaf blight (also known as Keithia blight or Keithia leaf blight), a leaf disease, on western red cedar ("Thuja plicata") and white cedar ("T. occidentalis").

Toona ciliata: Toona ciliata is a forest tree in the mahogany family which grows throughout southern Asia from Afghanistan to Papua New Guinea and Australia.  It is commonly known as the red cedar (a name shared by other trees), toon or toona (also applied to other members of the genus "Toona"), Australian redcedar, Burma cedar, Indian cedar, Moulmein cedar or the Queensland red cedar.  It is also known as Indian mahogany.

Red Cedar Technology: Red Cedar Technology is a software development and engineering services company.  Red Cedar Technology was founded by Michigan State University professors Ron Averill and Erik Goodman in 1999.  The headquarters is located in East Lansing, MI, near MSU's campus.  Red Cedar Technology develops and distributes the HEEDS Professional suite of design optimization software.  HEEDS is based on spin-out technology from Michigan State University.  On June 30, 2013 Red Cedar Technology was acquired by CD-adapco.

Syntexis libocedrii: The Anaxyelidae are a wood wasp family within the Symphyta, containing only a single living species, Syntexis libocedrii, (also called the cedar wood wasp or incense-cedar wood wasp), though the family has an extensive Mesozoic fossil record; this species is thus a "living fossil".  It has the remarkable behavior of ovipositing only in recently burnt incense-cedar ("Calocedrus"), red cedar ("Thuja") or juniper ("Juniperus"); the wood is often still smoldering when the wasp is laying its eggs, and the larvae develop in the wood.  It occurs from the mountains of central California to southern British Columbia, but is very rarely seen, except by firefighters.

Glengarra Wood: Glengarra Wood is a mixed woodland in Ireland located 15 km southwest of Cahir, Co.  Tipperary off the M8 motorway and R639 road.  Approximately 570 ha in extent, it is situated on Old Red Sandstone on the southern slopes of the Galtee Mountains.  It is mainly a coniferous forest with Sitka Spruce being the main species.  Other conifer species present include Scots Pine, Japanese Larch, Douglas Fir, Norway Spruce, Western Hemlock and Western Red Cedar.  The area also contains approximately 50 ha of native Oak, Birch and Alder.  Animals present include fallow deer, foxes, badgers, hares and red squirrels.  Birds include pheasants, hawks, kestrels, ravens, herons and many song birds.

Alberta Pacific Grain Company: The Alberta Pacific Grain Company Limited began as the Alberta Grain Company founded by Nicholas Bawlf and associates.  In 1911 Alberta Grain Co. was merged with the Alberta Pacific Company Limited to form the Alberta Pacific Grain Company Limited.  In 1967 the company was taken over by Federal Grain.

Grain (surfboard company): Grain Surfboards is an American company that manufactures custom and originally designed hollow wooden surfboards.  The surfboards are made primarily from Northern White Cedar, with some Western Red Cedar added for color accent.

Cedar River (Iowa River): The Cedar River is a 338 mi river in Minnesota and Iowa.  It is a tributary of the Iowa River, which flows to the Mississippi River.  The Cedar River takes its name from the red cedar ("Juniperus virginiana") trees growing there, and was originally called the Red Cedar River by the Meskwaki.  The first Mississippi steamboat reached Cedar Rapids, Iowa in 1844, and during the next decade, the Red Cedar (as it was still called) was an important commercial waterway.  The surrounding region is known officially as the Cedar River Valley, though it is more commonly referred to simply as the Cedar Valley.

Trillium ovatum: Trillium ovatum, the Pacific trillium, western trillium, western wakerobin, or western white trillium, is a member of the Trilliaceae family, or sometimes included within the Liliaceae or Melanthiaceae.  It occurs in parts of the western United States and western Canada, usually in rich forest.  In the northern part of its range, which includes southern British Columbia, extreme southwestern Alberta, Washington, Oregon and east to Montana, Wyoming and northern Colorado, it often grows under Douglas-fir.  Other trees which frequently shade this trillium include grand fir, western red cedar, and western hemlock; bigleaf maple, red alder and Sitka spruce join in near the coast.  Flowering peaks in April

Supporting paragraphs: Grain (surfboard company) Thuja plicata
Answer: surfboards