Book Binding with Two Studs

Technic Link Tread Wide with Two Pin Holes, Soft Plastic Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] Technic Pin with Friction Ridges Lengthwise with No Center Slots Tile Round 1 x 1 Brick 1 x 4 Technic Brick 1 x 2 [2 Pin Holes] Plate Special 1 x 2 Rounded with 2 Open Studs Technic Axle Pin 3L without Friction Ridges and 2L Axle Panel 1 x 2 x 2 [Side Supports / Hollow Studs] Tile 1 x 4 with Groove Plate Round 1 x 1 with Solid Stud Technic Tread Sprocket Wheel Small 6 Tooth