7″s (often referred to as 45s) can be cut at 45rpm or 33⅓rpm. When cut at 33⅓rpm you can have more minutes per side, yet the sound quality deteriorates the more content you want to press on a record (hence we suggest that you rather enlarge the format than compress the content and stick with 45rpm for a 7″).
You have a choice of 7″ records with small and large (jukebox style) centre holes. 7″ can be made as heavier vinyl versions (70g instead of 40g) if preferred.