Micro Safari Aqua is the best way to view and keep microscopic aquatic ecosystems alive. Technical Specs Material: Optical-Grade Acrylic and LDPE polymer film with controlled diffusion rates Dimensions: 26mm (Length) x 75mm (Width) x 4.5mm (Height) Minimum objective working distance: 1mm Grow Powder Ingredients: Plant-based growth medium for sustained ecosystem energy Two month nominal organism lifespan inside of slide (individual results may vary) Microscope Compatibility: Micro Safari Aqua works with any microscope that has a working distance of greater than 1mm. Ideal for transmitted light compound microscopes or high magnification digital microscopes. Note that the highest magnification objectives on many microscopes may not work with Micro Safari Aqua Slides because the bottom of the objective has to be 0.17mm away from the sample AKA the thickness of a microscope slide cover slip. You will need to use a typical microscope slide and cover slip to achieve these magnifications. However, We find that the highest microscope objectives on consumer grade microscopes are blurry and actually contain less visual information than the lower magnification objectives. Depth of field also make high magnification objectives practically difficult to observe samples with. We rarely use the highest magnification objectives. If you are new to microscopy you should purchase regular microscope slides as well so that you can get a hands-on understanding of the mechanics of using high magnification objectives.