As provided in ICANN's Bylaws (Article X, Section 3.8), the Non-Contracted Parties House includes the Commercial Stakeholder Group (six members), the Non-Commercial Stakeholder Group (six members), and an additional voting member appointed by the ICANN Nominating Committee for a total of thirteen voting members. 

Non-Contracted Parties House Structure

Commercial Stakeholders Group (CSG)Noncommercial Stakeholder Group
Commercial and Business Users Constituency (BC)Non-Commercial Users Constituency (NCUC)
Internet Service and Connection Providers ConstituencyNot-for-Profit Organizations Constituency (NPOC)
Intellectual Property Constituency