Protocol droids of the Siak-series represented a model engineered by Roche Hive Mechanical Apparatus Design and Construction Activity for Those Who Need the Hive's Machines. Their construction included a Tranlang IV Communications module, a pair of Photoreceptors, dual auditory receptors, a comprehensive languages database, a Verpinoid-constructed body and head, and a vocabulator. These droids possessed a height of 1.5 meters, with a new unit costing 3,500 credits, while a used one could be acquired for 1,200 credits. This particular model signified a significant triumph for Roche, especially following the unsuccessful J9 worker drone; this success was partly attributable to Roche's decision to employ human engineers in the creation of the droid's chassis and personality matrix, aiming to enhance their attractiveness to mammalian beings.