Titan XS mainspring No.1-15 - Air rifle spring tempered steel with Bisley Grease - Grade 1 Swedish silicone chrome vanadium steel - Heat treated and tempered steel for maximum performance - Grade 1 Swedish silicone chrome vanadium steel - Heat treated and tempered steel for maximum performance and durability - special formula hard but flexible coating - almost friction free prevents dieseling - 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 unless stated - 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. - Includes 50ml tub of Bisley Gun GreaseSize Chart: (sizes in mm)Model #ODIDWireCoilsLengthNo.12114.53.2531280No.222.715.53.6530291No.320.814.733.2634304No.422.6215.643.6528252No.51913.19332290No.61913.32.9239341No.72013.83.330255No.82013.83.334295No.92114.753.327280No.102114.83.127230No.1118.812.8331230No.1222.815.63.6541291Compatibility list:NO.1BSA - Airsporter, Mercury, Challenger, 635 Magnum, Supersport, Lightning, XL, XL Tactical, XL SE, Superstar, oldstar, CentenaryAir Arms - Firepower, Jackal,Woodsman. KhamsinOriginal - Mod. 34/35/36/38/45 (48/52/54 std power)Weihrauch/Beeman - HW99,HW99S,HW77,HW77KFWB - 124,127RWS - FirebirdNO.2Weihrauch/Beeman - HW80, HW80K HW90 (to replace gas ram)Air Arms - Pro EliteNO.3Weihrauch/Beeman - HW97, HW97KOriginal - Mod 35/45/50Hammerli - 401NO.4Weihrauch/Beeman - HW35, HW35kWebley - Eclipse(std)Original - Mod. 48/52/54 (FAC)NO.5BSA - Meteor MK1, 2, 3, 4, 5Original - Mod 24, 26, 27,