These amazingly detailed DIY models start as 4-inch square steel sheets and finish as amazing 3-D models. Use the easy-to-follow instructions included with the sheet to pop out the pieces, bend the tabs, and connect them at the attachment points! Parts can be easily removed from the metal sheets using a pair of clippers. Tweezers make an ideal tool for bending or twisting the connection tabs Number of sheets: 3 Sheets Difficulty: Challenging. Assembled Size: Engine: 4.25\" x 0.79\" x 1.34\" Coal Car: 2.44\" x 0.71\" x 1.06\"