There's only so much room in my lab - so I'm thinning out my duplicates and spares (more than 2 is hoarding, my wife and counselors tell me ;-) Offered this morning is a very large set of SpeedCarrier cassette holders and 22 custom milled negative inserts. If you have ever held in your hands an LPL negative carrier, you would most likely notice how good the metal is (they are thick, smooth and very well built). These inserts are of that kind of quality. I love using them. These were all custom machined (in a machinists shop, not some hack in his basement with a file and a 6-pack of beer) - to precision sizes. Here are the dimensions in millimeters for each; 23.75x35 25x42 25.5x38 26x37 35mm slide carrier 55x55 55x66.5 56.5x69 57x44 57x57 57x57.5 57x82 57x82 57.5x45 58x45 58x71.5 58.5x83 70x82 95x120.5 95x120.8 95x121 95x121 This set comes with three cassette holders (even though you only see two in the photos). These are not hinged carriers they are loose but have indexing pins on each. I found that adding some thin packing tape made them really easy to use (plus I marked each with its actual size for quick identification). Price: $200 plus shipping PayPal is cool, cash in person will get you a discount and plenty of conversation!