A. DRAWING SYSTEM
A1. pen holder
A2. pen holder cap
A3. marker slot
A4. cylinder
A5. pen nib hole
B. POWER SUPPLY SYSTEM
B1. spiral cable
B2. power cable
B3. power adapter
C. MOTION SYSTEM
C1. structural wire
C2. wire tightener
C3. wing
C4. pulley
C5. ball caster
D. ERASING SYSTEM
D1. ceramic heater
D2. ceramic holder