What pen is recommended for primary school students to practice hard pen calligraphy?

Pupils can practice hard pen calligraphy with this 0.7mm pen of Chen Guang GP111. In addition, it is also recommended to use the 0.5mm stylus of BLN-VBG5 model in Bai Le, or the 0.7mm signature pen of PC 1838 model in Baoke. These pens are suitable for practicing hard pen calligraphy.