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diff --git a/Assets/pen/Pen.unity b/Assets/pen/Pen.unity
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diff --git a/Assets/pen/pen_body.mat.meta b/Assets/pen/pen_body.mat.meta
new file mode 100644
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diff --git a/Assets/pen/pen_dots.mat b/Assets/pen/pen_dots.mat
new file mode 100644
index 0000000..206ef18
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diff --git a/Assets/pen/pen_dots.mat.meta b/Assets/pen/pen_dots.mat.meta
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diff --git a/Assets/pen/pen_mat.mat b/Assets/pen/pen_lines.mat
similarity index 99%
rename from Assets/pen/pen_mat.mat
rename to Assets/pen/pen_lines.mat
index 71a8186..c4039b1 100644
--- a/Assets/pen/pen_mat.mat
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diff --git a/Assets/pen/pen_mat.mat.meta b/Assets/pen/pen_lines.mat.meta
similarity index 100%
rename from Assets/pen/pen_mat.mat.meta
rename to Assets/pen/pen_lines.mat.meta