Reference: Ployhedron Origami for Beginners - Miyuki Kawamura
No of units: 4 units (Yellow for vertices) + 6 units (Green for edges)
Paper size used : 5" x 5"
Difficulty: very easy , easy to assemble and very sturdy model.
Paper used: normal color printer paper
Time: 1.5 to 2 hours
No glue or paper clip used.