Nikon R1C1 Wireless Close-Up Speedlight System 4803 B&H Photo
Godox AK-R1 Round Head Accessories Kit & Godox S-R1 Flash Head Adapter | Compatible for Godox V860II TT685 TT600 and Canon Nikon Sony Camera Flash Speedlight - Newegg.com
R1C1 macro flash kit - Dennis Saßmannshausen Photography
Nikon 4804 R1 Wireless Close Up Speedlight Flash System (Macro Kit B, !) at KEH Camera