http://www.scubasworld.com/images/pdfs/slspeargunmanual.pdf

For many years, the Cressi-sub pneumatic speargun has set a standard of functional dependability sought after by beginners to world class competitors. Simplicity is the key to reliability! This, in conjunction with experienced engineering, top quality materials, state of the art production methods, and quality control, produces a most desirable underwater hunting device.The SL Star range of pneumatic spear guns has been in production for many years now, and they have won worldwide fame for their excellence in terms of robustness, reliability, precision and powerful shooting. The various models correspond to the equivalent models in the SL series, without power reducer. Constantly updated over the years, the SL Star spear guns are ultra light, easy to use, and fire quickly. They come with anatomical high grip butts enabling the gun to be held in line with the arm with no extra effort. The bright yellow butt means you can identify the gun even if it ends up on the sea-bottom after shooting. A strong line hook is situated on the bottom of the butt for shaft loading. The guns are fitted with a safety catch and, when the trigger is pulled, it frees the line releasing device. The SL Star spear guns come with an 8 mm threaded steel shaft. Stainless steel shafts are available separately. The SL Star spear guns come in three lengths: SL 40 (40 cm long) SL 55 (55 cm long) SL 70 (70 cm long)