This is an injection-plastic detail parts set for use with aircraft kits.
A boxed set of the 1/144 IJN Carrier deck sections previously issued by Sweet. Includes one elevator section (approximately 15 by 17cm when assembled). The elevator parts are separate from the surrounding deck, so it would be possible to build a diorama with the elevator below the deck level if you were so inclined. Also includes four extension pieces, each approximately 15 by 4cm, for a total deck piece (with elevator) of about 15 by 33cm, and eight sets of wheel chocks.