The airsal piston kit for benelli 491 50 lc 2004-2006 is part of the latest collection from airsal.Features: airsal cylinders are made in aluminium and scanimet coating nickel silicon carbide . This coating improves resistance to wear and tear also the mechanical properties of the cylinder hardness 600 wickers , flexibility, lower heating besides low friction coefficient are the main differences against the cast iron cylinders specifications: product name: piston kit units: kit to fit: aprilia area 51 50 1999 european models aprilia area 51 50 2000 european models aprilia area 51 50 2001 european models aprilia area 51 50 2002 european models aprilia gulliver 50 lc 1997 european models aprilia gulliver 50 lc 1998 european models aprilia gulliver 50 lc 1999 european models aprilia rall modelsy 50 lc 1999 european models aprilia sonic 50 lc 2000 european models aprilia sr 50 lc 1994 minarelli horizontal cylinder european models aprilia sr 50 lc 1995 minarelli horizontal cylinder european models aprilia sr 50 lc 1996 minarelli horizontal cylinder european models aprilia sr 50 lc 1997 minarelli horizontal cylinder european models aprilia sr 50 netscaper 1997 minarelli horizontal cylinder european models aprilia sr 50 netscaper 1998 minarelli horizontal cylinder european models aprilia sr 50 racing 1997 minarelli horizontal cylinder european models aprilia sr 50 racing 1998 minarelli horizontal cylinder european models aprilia sr 50 racing 1999 minarelli horizontal cylinder eu...