Inspirational 33+ Full Size Acoustic Guitar. There are dinky little guitarleles and enormous jumbo acoustic guitars. Spanish guitar, gypsy guitar, 7 strings guitar, made by hora. The parlor sized guitar is the smallest steel string guitar size apart from travel and mini guitars. The term 'full size' guitars can cause some confusion as each type of guitar (eg: Full Size Acoustic Guitar - Klos Deluxe Full Size Acoustic Electric Guitar With Gig Bag And Accessories There are dinky little guitarleles and enormous jumbo acoustic guitars.