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Roller brushes of different sizes are necessary when painting. People should buy several brushes with different types or paint with low efficiency(painting a big wall with a short brush). With "1+1+ =1", the modular brush, various demands can be met with one type of brush. All the brush modules can be connected easily by the screw mechanism.
Shudan Lin Ningning Zhu Hailing Zhong Duochun She