36000/6 Castline M2 Machines Auto-Haulers - Tractor Trailers Release 6. 1:64 scale diecast collectible models, These tractor trailers are about 10" long die cast model cars. GM is a trademark of the General Motors Corporation. Each car sits on a display plaque, and individually packed in a hard plastic case. Case size is 11.25"L x 3"W x 3.25"H. Manufactured by Castline. 6 pcs per inner. Launch date: April 15, 2012.