Here is some info i found on the Spetton website which have adopte the valentin in their new Champion speargun
Classic model in French and Spanish fishing. It was designed by Marc Valentin and after many years on the market, it is still one of the most popular spearspearguns. Because of its simplicity and reliability, this is a best-seller speargun.
HANDLE: Over-dimensioned trigger to facilitate handling with thick gloves in winter. MV handle with treble dismultiplication, less drag. Line release clip with mechanic operation mounted on bracket. Barrel guide with line retaining clip.
HEAD: Traditional design, nylon injected. This speargun absorbs the energy transmitted by 20mm rubbers. It can perform single rubber operation.
TUBE: Light aluminium, galvanized during its manufacturing process. There is a guide bracket with line retaining and releasing clip. 28mm diameter and different lengths. Refer to the Dimensions Chart.
RUBBERS, WISHBONE, SPEAR: 16mm natural rubbers. Articulated detachable wishbone with 4mm stainless steel arms. 6.25mm hardened stainless spear.