Check the listing for details. MODIFIED FOR QRP 40 METER CW 4 PACK IN FT-243 HOLDERS. Condition: Used. Listed at 23.00 USD. YOU ARE PURCHASING ONE LOT OF 4 QRP CRYSTALS IN USED FT-243 HOLDERS. ONE EACH OF 7048, 7060, 7110 & 7122 KHZ 40 METER CW FREQUENCIES. 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. HOWEVER, THESE ARE SMALL HC49/S CRYSTALS (SEE PHOTO), 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 USING THEM FOR QRP ONLY, IN THE ONE TO TWO WATT RANGE. IF YOU ATTEMPT TO USE THEM IN A SINGLE TUBE TRANSMITTER LIKE THE 6V6, 6L6, 6DQ6, ETC., YOU'LL GET CHIRP AND INSTABILITY. THESE CRYSTALS ARE NOT DESIGNED TO HANDLE THAT MUCH POWER. I HAVE SEVERAL SETS AVAILABLE, SO THESE ARE GENERIC PHOTOS. ALL CRYSTALS WILL BE IN THE FT-243 HOLDERS, OF WHICH THERE ARE SEVERAL DIFFERENT STYLES. THE CRYSTALS ARE NEW, BUT THE HOLDERS ARE FROM OLD USED STOCK. I SIMPLY TAKE OUT THE ORIGINAL FT-243 BLANKS AND REPLACE THEM WITH THE CRYSTAL TYPE THAT YOU SEE IN THE THIRD PHOTO. FREQUENCIES ARE APPROXIMATE, BUT GUARANTEED CLOSE TO THAT SPECIFIED. SHIPPING TO THE UNITED STATES ONLY.