Features:Samples preserved in cedar wood oil and sealed with a coverslip to preserve specimens and prevent contamination.Slides are composed of optical glass for clear viewing.Labeling provides specimen identification.Set of 25/50/100 prepared slides, including plants, insects, and animal tissues, for use in biological education. Set comes in fitted wooden storage box to prevent breakage and ease handling. Package Includes:25/50/100 Pieces Microscope Slides Specifications:Material: Glass+WoodenSize: 7.5x2.5cm/2.95x0.95 in note:Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item.