Primary and middle school students write 2 pens with low center of gravity

Style: simple
Color classification: red/low center of gravity/single (free 5 barrels of refills) blue/low center of gravity/single (free 5 barrels of refills) black/low center of gravity/single (free 5 barrels of refills) silver/low center of gravity /Single (free 5 barrels of refills) single free 2 barrels of refills + 1 KOKUYO rubber blue single free 2 barrels of refills + 1 KOKUYO rubber black single free 2 barrels of refills + 1 KOKUYO rubber silver Single free 2 barrels of refills + a KOKUYO rubber pen type: mechanical pencil 0.5mm
Refill hardness: HB
Applicable scene: writing positive posture
Count: 1
Number of colors: monochrome
Whether the standard has a rubber head: N