ZVac Clarke-Alto Combi-Vac, 514/517/518/614/618 - Filtervac 14 & 18, FilterPac BP (Fits similar to OEM-50721, 50704A-2) Filter Bags (Pack of 10) Fit similar to OEM: 50721, 50704A-2 Traps microscopic particles and allergens Contains: 10 Bags These bags are great, won't tear or break OEM Standards, High Quality and Great Value only by Zvac