This looks to have been very little used.
eBay
Flexible Metal Tube Rod Monopod Selfie Stick Stands with 1/4inch Screw/ Ball Head Extension Arm for Camera Tripod Mobile Phone
Aliexpress UK
With a manufacturer warranty of one month, you can trust in the durability and reliability of these extension tubes. Compatible with Fujifilm, this set is perfect for photographers looking to capture stunning close-up shots.
eBay
FOTGA Macro Extension Tube Ring Set for Nikon F-Mount DSLR Camera Lens D7500 D7200 D7100 D7000 D90
Aliexpress UK
This Extension tube set does not affect image quality as there is optics inside. It moves the lens farther from the film or digital sensor. Exposure and focus have to be adjusted manually. -increase ISO, decrease shutter speed;.
eBay
MEIKE MK-S-AF3A Metal Auto Focus Macro Extension Tube Adapter Ring 10mm 16mm for Sony Mirrorless E-Mount FE-Mount A7 NEX Camera
Aliexpress UK
Sony a7, a7R, a7S, a7 II, a7R II, a7S II, a9, a7R III, a7 III. This macro extension tube set can be transform your lens into a macro lens. You have 8 range of different combinations. Extension tube set does not affect image quality as there is no optics inside.
eBay
Macro Extension Tube Ring For Sony E NEX Camera Lens A7 A7R NEX-7 5T 6 5 3 A6000
Aliexpress UK
Here we have a great selection / collection of vintage extension tubes and tele converters from makes such as Super Paragon , Vanguard , Aico ,Tamron , Starblitz , Vivitar all in very good used condition , please see all photos as they form part of the description for this item
eBay
FOTGA Electronic Auto Focus Macro Extension Tube 12mm DG II for Canon EF S Camera
Aliexpress UK
The ring adapter can't auto focusing :The adapter ring has no electrical connection and diaphragm & focusing are required to be set by manual. 1 X Photography Extension Tube. Thread: Both the adapter are universal M42x0.75 thread.
eBay
Tripod Extension 2 Section Alloy Aluminum Tripod Extender Tube Telescopic Stick Rod, Compatible with Tripod/Gimbal/Camera
Aliexpress UK
Sold as seen Enhance the capabilities of your Pentax Praktica camera with these fully automatic extension tubes. These tubes, which come in 11 mm, 20 mm, and 30 mm sizes, attach to the front of your lens and allow you to focus closer to your subjects, enabling you to capture stunning close-up shots with ease. They are designed to fit lenses with a 30 mm front thread and are compatible with Praktica cameras. Made for photography enthusiasts who want to take their skills to the next level, these extension tubes are an excellent addition to your camera gear. They are made by a renowned brand, PRAKTICA, and are ideal for anyone looking to explore the world of macro photography.
eBay
Meike MK-S-AF3A Metal Auto Focus Macro Extension Tube 10mm 16mm for Sony Mirrorless a6300 a6000 a7 a7SII NEX E-Mount Camera
Aliexpress UK
The tubes are all in super condition and the mounts are nicely tight when fitted. Lenses - I always highlight any major dust (of course there is always micro-dust in older lenses!)., fungus or other imperfections I see in a lens as I want to be scrupulously precise about the condition.
eBay
Carbon Fiber Center Column Extender Tube Extension for Tripod Monopod 22/25/28/32mm Camera Mount
Aliexpress UK