7075 alloy.
eBay
PASS QUEST 110 bcd chainring for shimano 105 r7000 ultegra r8000 dura ace R9100 110bcd 4 bolt road bike plate double chainrings
Aliexpress UK
TA Vento Chainring 135 Bcd 42 Tooth. Dispatched with Royal Mail 2nd Class Large Letter.
eBay
STONE Circle Aero Chainring BCD 130mm 5 Bolts for Brompton 3Sixty FNHON Folding Bike Road Bike Chainwheel Chain Ring N/W Teeth
Aliexpress UK
The small ring doesn't have any special differences, so can go with any bigger ring as long as that bigger ring is matched to go with a 39t. - these say 53/39 on the large ring so are optimized to shift up and down from a 39t inner ring.
eBay
Prowheel Road Bike Chainring 110 BCD Chainring Ultralight 34/50T Double Chainwheel 8/9/10/11 Speed Bicycle Chain Ring Bike Part
Aliexpress UK
In great condition and runs perfectly straight, see my other bike parts/ chainrings
eBay
BUCKLOS Road Bike Chainring 110 BCD Chainring 4Hole 5Hole 34/36/39/50/52/53T Chainwheel Double Speed Road Bicycle Crown
Aliexpress UK
Alloy chainring. Also available in 130mm and 144mm BCD from Sprockets UK. Stronglight Dural 5083 9/10Speed 110mm BCD Inner/Outer Chainrings 50T 34T Black. Campagnolo FC-RE950 Record 12 Speed 145 BCD Chainring 50T.
eBay
BUCKLOS 110BCD Chainring Double Speed Road Bike Chainring 34/36/39/50/52/53T 110 BCD Bicycle Chainwheel for R7000 R8000 R9000
Aliexpress UK
AS Chainring.
eBay
PASS QUEST 94 bcd chainring 5 bolt ROUND Narrow Wide Chainring 32/34/36/38/40/42/44/46T for 10/11/12 speed bike chain
Aliexpress UK
Campagnolo 2013 - 2017 Athena Triple 11S outer chainring, 52T for 52/39/30 setup, 5 bolt, 135mm BCD with one hidden bolt.
eBay
PASS QUEST 110 bcd 4 bolt chainring for shimano grx fc rx600 rx810 round oval narrow wide chainring 36 40t 42t 44t 46t 50t 52t
Aliexpress UK
Has been fitted but not ridden
eBay
PASS QUEST 94 bcd chainring 5 bolt ROUND Narrow Wide Chainring 46T/44T/42T/40T/38T/36T/34T/32T/ for 10/11/12 speed bike chain
Aliexpress UK