Price is for one spring, 38mm wide and fits all models of solvent filters. These springs are made of high tensile carbon steel covered with a corrosion resistant coating. This means that they are durable under pressure, heat, and solvent. They will retain their compression strength, even when compressed over a long period of time inside your cannister. Tightly compact springs between (barrel) end cap and cups for a coil of steel (headspace) that allows room for expansion & your cleaning brush, but holds cups tightly in place.