The Gepe 35mm Glassless Slide Mounts are self-sealing mounts that can be easily locked together in position.The metal-mask comes with clips to ensure that the slide stays in place securely and  produces sharp edges around the imageHigh-quality plastics with temperature resistance of up to 100 degrees C are used in the manufacturing of these slidesThis slide mount is highly stable as it comes with two inter-locking halvesHolding the slide completely flat, this mount makes the focused projection of the entire image easyThese 2mm thick slide mounts are glassless