Langstroth Beehive Frame - Medium (Super) with 5.5mm Comb start integrated. This is the typical size for a super box. I also have other sizes and open frames without the comb pattern integrated. Check my other posted models for those. Fit is pretty tight on this one. It works fine for me. I think that is best, so no glue is necessary. Depending on the tolerance capability of your printer it may require some sanding down to get a it to fit. If necessary let me know and I can open up the gaps for a looser fit.