The Solofill® 3 Chrome reusable K-Cup® filter works with all first-generation Keurig® K-Cup® coffeemakers including the K-145 and K-155 OfficePRO®. There are a few very terrific features designed into the Solofill® 3 Chrome Refillable K-Cup® starting with the hinged lid. The hinged lid offers long-life to the Solofill 3. Use any ground coffee or loose leaf tea and never worry about running out of filters. The Solofill® 3 uses a ultra-fine, permanently mounted, micro mesh filter fused into the 100% BPA-free refillable K-Cup® filter. Think of the number of K-Cup® Pods that will not go to landfills when using the Solofill 3 Chrome refillable filter with your Keurig® brewing system. Moreover, the smooth internal surface makes cleanup a snap. The Solofill® works just as well with loose leaf teas and soft pods too.