You must use tacks before? And there are two obvious drawbacks of traditional tacks: should perforation on the paper and the tack is difficult to draw out.
Designer Lee Yin Kai and Wang Szu - Hsin have been redesigned the tacks. Now they combine the function of clamps and tacks for using easily. It can be on the paper without damage, and can be repeated use, and easily to pull out, not easy to roll around.
Written by Dora Men