The Estes Engine Mount Parts set contains 27 parts to build motor mounts. This set includes:

• Three BT5 body tubes (2 inches long)
• Three BT5 yellow engine blocks
• Three BT5 Mylar engine hook retainer rings
• Three BT20 body tubes (2.75 inches long)
• Three BT20 engine blocks
• Three BT20 Mylar engine hook retainer rings
• Three BT50 body tubes (4 inches long)
• Three BT50 yellow engine blocks
• Three BT50 black engine hook retainer rings