Bonkyo (palm-leaf manuscripts) are Indian-style bound books where Sanskrit is written on palmyra leaves or similar materials, sandwiched between two boards (clamping boards), with small holes drilled and strings threaded through them as binding. The bonkyo preserved at Miidera are made of thick paper fashioned like palm leaves, with both Sanskrit and Chinese characters written in seven lines each, detailing the titles and phrases of mantras. The clamping boards are made of sandalwood, with three grooves carved on both sides, and the front left edge inscribed by Enchin in his own handwriting with the title "Vairocanabhisambodhi Sutra Mantra and Twelve Devas Mantra, missing Brahma Devas; [acquired] by the Qi River." Additionally, a note inside the cover states, "This book is missing one leaf; do not even momentarily remove, defile, or destroy leaves.” Currently, nineteen leaves exist, but based on the numbering of the leaves, with the last number being twenty-three, it is presumed that there were originally twenty-three leaves.