1. plastic pencil cases, mainly more resilient materials such as PV;
2. wooden pen holder, wooden pen almost no restrictions, mainly on account of factors apparently not high, also needs to bring some toughness;
3. metal pen, metal Pencil Cup is mainly dominated by Tin, lightly and does not rust;
4. bamboo pen, this is very simple, the production process is relatively simple, mainly need polishing process;
5. bubble pen, are generally more resilient foam material;
6. ceramic pen holder, fine and elegant.