Check the listing for details. Film Developing Tank 3 Spirals 120 135 4x5 B&W Negative Darkroom Processing. Condition: New. Listed at 15.99 USD. Three Spirals Processing Film Developing Tank for 120 135 Black and White Film Features: 1.3 Spirals Reel Developing Tank: This developing tank can be used as a 1530 developing tank or as a 1520 developing tank by removing the extension. The 1530 developing tank: It can be accommodated the 4 rolls of 120 films at a time or 3 rolls of 135/35mm films. (Supports simultaneous development of 35mm film and 120 film with one canister.) The 1520 developing tank: It can be accommodated the 2 rolls of 120 films at a time or 2 rolls of 135/35mm films. Material: plastic. 2.4x5 Spiral Reel: It can process six sheets of 4x5 film at a time, which suitable for Wigobolt 1530 tank,1520 thank and Jobo developing tank. 3.Manual Rotation Processor: The round wheel contain plastic bearing in the center, this design increase the maximum rotation speed. Compatible for Wigobolt 1530 tank, 1520 tank and Jobotank. Package included (according tobuyerchoice): 1x 3 SpiralsReelDeveloping Tank (includes 3 Spirals reel) OR 1x 4x5 Spiral Reel OR Developing Tank (includes 3 Spirals reel) + 4x5 Spiral Reel OR 1x Manual Rotation Processor