UFO

What there is most of

• Plate Round 1 x 1 with Solid Stud · Bright Green×12
• Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] · Light Bluish Gray×4
• Brick Round Corner 3 x 3 x 1 No Studs · Light Bluish Gray×4
• Plate Round 1 x 1 with Open Stud · Trans-Light Blue×4
• Plate Special Round 1 x 2 Half Circle with Stud (Jumper) · Green×4
• Wave / Lightning Angular, Single · Trans-Light Blue×4
• Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) · Dark Bluish Gray×3
• Technic Axle 2 Notched · Red×2
• Technic Axle Connector Smooth [with x Hole + Orientation] · Black×2
• Brick Round 2 x 2 with Axle Hole · Trans-Light Blue×1
• Brick Round 2 x 2 x 1 2/3 Dome Top, Hollow Stud · Trans-Clear×1
• Dish 6 x 6 Inverted (Radar) with Solid Studs · Light Bluish Gray×1
• Minifig Head [Plain] [Vented Stud - 2 Holes] · Trans-Yellow×1
• Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) · Black×1
• Plate Round 4 x 4 with Pin Hole · Bright Light Orange×1
• Plate Round 4 x 4 with Pin Hole · Green×1
• Plate Round 6 x 6 with Hole · White×1
• Technic Axle 4 · Black×1

The twenty most numerous parts, longest bar first. Start a checklist to see all 18 part types and tick them off as you find them.