... Safety, environmental-friendly, non-toxic, no gum. pen container Features:1.It can stick on the white board to ... film slowly. To avoid causing unrecoverable damage of the pen holder panel, affect the usage in the future.3. ... affect the usage and functions.4.Do not use the pen holder/vase on uneven, rough or porous material surfaces, ... paper wall,cob wall, sand wall and patterned tile wall. pen container