Check the listing for details. MODIFIED FOR QRP 40 METER CW 4 PACK IN FT-243 HOLDERS. Condition: Used. Listed at 18.95 USD. YOU ARE PURCHASING ONE LOT OF 4 QRP CRYSTALS IN USED FT-243 HOLDERS. ONE EACH OF 7050, 7055, 7060 & 7070 KHZ FUNDAMENTAL FREQUENCIES. THE SMALL HC49/S CRYSTALS HAVE BEEN INSTALLED. I HAVE USED THESE LITTLE CRYSTALS WITH GOOD SUCCESS IN LOW POWER QRP RIGS AND HAVE SOLD HUNDREDS OF THEM TO OTHER HAMS WHO HAVE HAD GOOD RESULTS WITH LOW POWER. THESE ARE SMALL QRP CRYSTALS, SO BE CAREFUL HOW MUCH CURRENT YOU DEMAND. I'VE NEVER DESTROYED ONE, BUT THEY CAN BE FRIED IF YOU PRESS THEM TOO HARD. I'VE HAD HAMS TELL ME THEY'VE USED THEM IN THE OLD HEATHKIT TUBE RIGS, BUT I'D ADVISE RUNNING THEM FOR QRP ONLY. OTHERWISE THEY MAY HEAT UP, CHIRP AND BECOME UNSTABLE. I HAVE SEVERAL SETS AVAILABLE, SO THESE ARE GENERIC PHOTOS. ALL CRYSTALS WILL BE IN THE FT-243 HOLDERS. THE CRYSTALS ARE NEW, BUT THE HOLDERS ARE FROM OLD USED STOCK. I SIMPLY POPPED OUT THE ORIGINAL CRYSTALS AND REPLACED THEM WITH THE CRYSTAL TYPE THAT YOU SEE IN THE SECOND PHOTO. SHIPPING TO THE UNITED STATES ONLY.