Flexitime Xtreme 2 Correct Flow Refill (6 x 50 mL Cartridges, 18 Mix Tips)The Original Single Unit Impression Solution With a Berry Twist. Experience enhanced physical properties for increased hydrophilicity. Improved tear strength and greater toughness. Achieve efficiency with a 30- to 90-second working time, perfectly suited for your more common single unit impressions. Impress your patients with its wild berry aroma. Distinguish between viscosities with high-contrast colors.