The designed reusable K CUP coffee filter is perfectly compatible with Ninja DualBrew Pro System CFP301, CFP201 and CFP451CO. The reusable K CUP filter is made of 304 stainless steel mesh and food-grade PP. The lid and the cup body are integrally formed, and when combined, they are and tight without gaps. The reusable K CUP filter allows you to enjoy the of a single cup of coffee without excessive waste. Over time, this can help you save coffee costs and reduce the impact on the environment. Reusable K CUP is easy to use. Pour your favorite ground coffee into the reusable K CUP coffee box. After use, pour the coffee grounds into the trash can and wash the reusable coffee box filter with water. color:Black Material:plastic size:51 x 46.5 x 36mm Package Contents: 4 x K cup coffee filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.