Lens Filter Cap

Lens Filter Cap
Canon Lens / filter size of the cover?

I'm buying the Canon XSi kit that comes with the option 18-55mm f/3.5-5.6 IS Lens. This is my first "real" camera outside the P & S. What size lens filter works with this objective? 72, 67, 52 mm? I would ask one before the camera is.

The filter size is 58 mm. Http: / / # www.bhphotovideo.com/c/product/519475-GREY/Canon_2042B002_EF_S_18_55mm_f_3_5_5_6_IS.html specifications

DIY Polarization Filter from 3D Glasses and a Lens Cap