Ox Mainspring Airgun air rifle spring - Square section high grade Swedish steel - Square section air rifle mainspring - Quality Swedish Grade A high content chome manganese carbon silicon - Square section air rifle mainspring - Quality Swedish Grade A high content chome manganese carbon silicone tempered steel - Heat treated and tempered steel for maximum performance and durability - special formula hard but flexible coating - tensile strength of 250000 lbs per square inch - does not lose power when cocked for long periods - PLEASE NOTE: installation of springs into air rifles sometimes requires removal of coils by grinding and/or cutting the spring. This is normal and, before purchasing and fitting, should be taken into consideration - We are unable to accept any returns with modified/damaged springs - sold as a single item - any accessories pictured are for illustration purposes only and are not included - packaging may vary from images shown - Removal and fitment of an airgun spring can be dangerous as they can be under considerable preload. If in doubt do not attempt the repair, consult a qualified gunsmith.Compatibility list:NO.1BSA Airsporter, Lightning, Mercury, Supersport, Superstar, Goldstar, Anschutz 335, Original 35, 38, 45, 50, RWS 24, 27, 34, 45, 50 reium, HW50, HW55, HW57, HW85, HW90, HW99, Haenel Lion, ASI CF 16/20, Webley Mk3 (if the spring guide is reduced by 20 thou)NO.2BSA Meteor, HW57, Milbro Diana G80 and 27, Norica, BaikalNO.3BSA Superstar (12ftlbs only), Webley (all models EXCEPT eclipse and MK3), Remington ExpressNO.4HW35 (Diana Orig RWS 52, 48, 54)NO.5HW80, Webley EclipseNO.6HW77, HW97, Feinwerkbau Sport, Also larger original models if ultimate power requiredNO.7ASI Sniper, Magnum (and all other ASI models) Diana 79 and GamoThis item has been checked that it does not violate the Firearms, ammunition, replicas and militaria policy. It is not a gun, rifle, pistol, frame or a receiver. It does not infringe any stated Firearms Policy.