Hey Truong!
Thank you for the feedback! Our second hands is actually long, not short. The second hands is 13mm - the maximum length you can fit into a Seiko 5 and dive watches before it scraps the watch case and stop the movement. Only 0.25mm away from damaging the watch case and movement.
Our hands are all designed for Seiko 5 and dive watches with standard dial size of 28.5mm and opening of 26.5mm diameter (13.25m radius). In other words, 13mm is the limit. Our hands are not designed for premium models such as brightz, sarb and presage, which usually have dial size over 30mm.
Hope you find this information useful. Nevertheless, thank you for the feedback. =)
Cheers,
Adriel