Use these replacement microneedling cartridges with your: Beauty Disruptor Microneedling Machine 3 in 1 or Pro-Secret Icy Gold RF Microneedling Machine.   The microneedling therapy is not only one of the best ways to reduce scars and stretch marks, it is also ideal for safely providing long term skin tightening and wrinkle reduction. Notice:  these cartridges are made exclusively for Rejuva Fresh machines and are not compatible with machines sold by other brands.  How the Technology Works: Microneedling activates the skin's natural healing process, boosting metabolism and the production of collagen and elastin, which in turn keep the skin smooth & glowing. Radio frequency (RF) therapy not only tightens skin and reduces wrinkles, it also helps break down and remove fat cells.  So there is a firming, contouring effect. Cold hammer soothes the skin and reduces any redness or puffiness following the other treatments.