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SL Type Door

Nichimo Sendai Type-L Trawl Doors, or SLs, are bottom trawl doors made of Japanese black pine.

Low gravity:

The vertical-type SLs have a low gravity center that won't be possible in a metal door, thanks to rich resin of black pine grown in Japan that generates good buoyancy.

Wide shoes:

Their wide shoes effectively keep SLs from tilting outward.

SLs are traditional, but remarkably easy-to-use wooden doors because of their low gravity center and wide shoes.