These are Genuine Presto® PowerCup Concentrator Don’t be Fooled by Imitations Only One Presto PowerCup Concentrator when used correctly should last 12 to 24 USE’S ! The Presto PowerCup Concentrator is specially designed to work with the Presto PowerPop. The PowerCup Concentrators are sold in a convenient 8 pack.---------------------------------------------------------------------SAVE on a 6 Pack, SAVE on Shipping Too! Presto PowerCup Concentrators $1.89 Presto PowerCup Concentrator ( 6 Pack) $10.74 Presto® PowerPop® microwave multi-popper $24.49 Presto® PowerCup Concentrators. For use with PowerPop® microwave multi-popper. Combines with PowerBase™ to focus microwave energy so effectively that virtually every popcorn kernel pops *Presto® is a registered trademark of National Presto Industries Inc. Cooking and Canning Company is a reseller of National Presto® products.