On the back of your card

Match the last three digits: 343.

What it is
Jumbo Jersey Sleeve Patch cards and their autograph/colour versions
Confirmed by
One source (tcdb.com)

Jumbo Jersey Sleeve Patch Cards (46 cards)

#PlayerTeam
JJSP-AAAristides Aquino RCCincinnati Reds
JJSP-ABRAlex BregmanHouston Astros
JJSP-AMAdalberto MondesiKansas City Royals
JJSP-APAlbert PujolsAngels
JJSP-ARIAnthony RizzoChicago Cubs
JJSP-BHBryce HarperPhiladelphia Phillies
JJSP-BMBrendan McKay RCTampa Bay Rays
JJSP-BPBuster PoseySan Francisco Giants
JJSP-BSBlake SnellTampa Bay Rays
JJSP-CBCody BellingerLos Angeles Dodgers
JJSP-CKClayton KershawLos Angeles Dodgers
JJSP-DVDaniel VogelbachSeattle Mariners
JJSP-EAElvis AndrusTexas Rangers
JJSP-EJEloy JimenezChicago White Sox
JJSP-FFFreddie FreemanAtlanta Braves
JJSP-JBJavier BaezChicago Cubs
JJSP-JBEJosh BellPittsburgh Pirates
JJSP-JDJacob deGromNew York Mets
JJSP-JGJoey GalloTexas Rangers
JJSP-JLJesus LuzardoOakland Athletics
JJSP-JSJuan SotoWashington Nationals
JJSP-JVJustin VerlanderHouston Astros
JJSP-JVOJoey VottoCincinnati Reds
JJSP-JYJordan Yamamoto RCMiami Marlins
JJSP-KBKris BryantChicago Cubs
JJSP-KLKyle Lewis RCSeattle Mariners
JJSP-KMKetel MarteArizona Diamondbacks
JJSP-MBMookie BettsBoston Red Sox
JJSP-MCMatt ChapmanOakland Athletics
JJSP-MKMax KeplerMinnesota Twins
JJSP-MSMax ScherzerWashington Nationals
JJSP-MTMike TroutAngels
JJSP-NANolan ArenadoColorado Rockies
JJSP-OAOzzie AlbiesAtlanta Braves
JJSP-PAPete AlonsoNew York Mets
JJSP-RARonald Acuña Jr.Atlanta Braves
JJSP-RDRafael DeversBoston Red Sox
JJSP-RHRhys HoskinsPhiladelphia Phillies
JJSP-SOShohei OhtaniAngels
JJSP-TMTrey ManciniBaltimore Orioles
JJSP-TSTrevor StoryColorado Rockies
JJSP-WBWalker BuehlerLos Angeles Dodgers
JJSP-WMWhit MerrifieldKansas City Royals
JJSP-XBXander BogaertsBoston Red Sox
JJSP-YAYordan Alvarez RCHouston Astros
JJSP-ZGZac Gallen RCArizona Diamondbacks

Jumbo Jersey Sleeve Patch Cards Autograph Parallel (25 cards)

#PlayerTeam
JJSA-AAAristides Aquino RCCincinnati Reds
JJSA-ARAnthony RizzoChicago Cubs
JJSA-BMBrendan McKay RCTampa Bay Rays
JJSA-BSBlake SnellTampa Bay Rays
JJSA-DVDaniel VogelbachSeattle Mariners
JJSA-JLJesus Luzardo RCOakland Athletics
JJSA-JSJuan SotoWashington Nationals
JJSA-JVOJoey VottoCincinnati Reds
JJSA-JYJordan Yamamoto RCMiami Marlins
JJSA-Jd Jacob deGromNew York Mets
JJSA-KLKyle Lewis RCSeattle Mariners
JJSA-KMKetel MarteArizona Diamondbacks
JJSA-MCMatt ChapmanOakland Athletics
JJSA-MKMax KeplerMinnesota Twins
JJSA-MSMax ScherzerWashington Nationals
JJSA-MTMike TroutAngels
JJSA-NANolan ArenadoColorado Rockies
JJSA-OAOzzie AlbiesAtlanta Braves
JJSA-PAPete AlonsoNew York Mets
JJSA-RARonald Acuña Jr.Atlanta Braves
JJSA-RDRafael DeversBoston Red Sox
JJSA-RHRhys HoskinsPhiladelphia Phillies
JJSA-TMTrey ManciniBaltimore Orioles
JJSA-WMWhit MerrifieldKansas City Royals
JJSA-YAYordan Alvarez RCHouston Astros

Search eBay for 2020 Topps Series 1 Jumbo Jersey Sleeve Patch cards and their autograph/colour versions

Where this code comes from

Hobby and Hobby Jumbo exclusive. Hobby 1:1,963; Jumbo 1:40.

  • tcdb.com: “Series One Hobby box and Hobby Jumbo box exclusive. Inserted 1:1963 Hobby packs and 1:40 Jumbo packs. Cards have production code #CMP037343 on the back bottom right.”

Other codes in 2020 Topps Series 1