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Film Developing Tank + Three Spirals Processing for 120 135 Black and White Specification: Tank size: 219mm x 122mm x 100mm (8.6in x 4.8in x 3.9in) Net weight: 492g Material: Non-toxic and tasteless ABS, no chemical reaction for developing and fixing. Developing capacity: *135/35mm film: 3 rolls *120 film: 4 rolls *220 film: 2 rolls *4x5 film: 2 rolls (Note: It needs additional 4x5 reel for 4x5 sheet film.) Processing: There are 2 methods to developing film: Continuous agitation by use minimal chemical quantity. Or intermittently agitation with full filled chemical. The design intention of the developing tank is to maximum the developing capacity within at the controllable size of the tank, and it's an rare product which can process 4 rolls of 120 film in one time!