There is a base on the pin so the ball rests on it when you hole the putt. They are available from a single flag to 18 flags all numbered. JLGOLF LTD : golf accessories at great prices! The hole is regulation size, 4.25".
eBay
Golf Training Cups with Flag Concise Turnover Prevent Golf Green Cups for Competition Portable Stainless Steel Golf Hole Cup
Aliexpress UK
1/4" High Pressure Washer Snow Foam Cannon Lance Gun 1L Bottle with 5 Nozzle New. 2x Front Shock Absorber Top Mount Strut Plate for Fiat 500 Panda Punto 51707691. Brushless Electric Turbo Jet Fan Strong Wind Air Blower for Makita 18V Battery.
eBay
Golf Putting Cup with Flag Stainless Steel Golf Hole Training Aid Practice for Backyard, Yard, Indoor Outdoor, Garage, Garden
Aliexpress UK
Stainless Steel Golf Green Cup Golf Flagstick for Yard, Golf Hole Cup and Flag. 10m For KARCHER K SERIES GREEN ANTI KINK POWER WASHER HOSE PIPE New. For BMW 3 Series E91 E90 Left Passenger Inner Door Panel Handle Pull Trim Cover.
eBay
3pcs/Golf Practice Equipment Flag Holder for Putting Holes Cup Sturdy Stainless Steel Practice Golf Cup Small Red Flag
Aliexpress UK
8Pcs Waterproof Dry Bag Storage Sack Set Hiking Camping Kayaking Fishing 1.5-13L. Solar Panel Powered Water Feature Pump Garden Pool Small Pond Aquarium Fountain. Folding Sling Lounge Chair Headrest Head Cushion Pillow for Beach Sun Lounger.
eBay
Indoor Golf Putter Mat Golf Putter Cup With Hole Flag Return Training Golf Putter Practice Auxiliary Ball Drop Boat
Aliexpress UK
There is a base on the pin so the ball rests on it when you hole the putt. A golf flag and hole set for your putting green. JLGOLF LTD : golf accessories at great prices!
eBay
Golf Hole Pole Cup Flag Stick for Garden Backyard Practice Training Detachable Portable Golf Putting Green Flagstick
Aliexpress UK
【Easy to Set Up】: Golf hole cup with drain hole, and to keep putting cup clean, very easy to set up, suitable for practice course. 1 Golf Putting Green Flag and Hole Cup. Size Chart.
eBay
PGM Golf Hole Cup with Hole Flag ABS Portable Indoor Golf Putting Trainer Putter Green Practice Home Yard Outdoor Training Aid
Aliexpress UK
This golf hole cup can also be used for golf training. What it gives you is a sturdy and durable golf cup because it is made of high-quality materials that resist impact;. 1 x Golf Hole Cup. Flag: 40cm x 15cm/15.75" x 5.91" (Approx.).
eBay
Golf Hole Pole Cup Flag Stick Detachable Anti-Rust For Yard Garden Driving Range Practice Training Golf Putting Green Flagstick
Aliexpress UK
Great for outdoor, indoor and backyard golf practicing and golfer aids. Easy to use and have fun, a great golf accessory on the green. Made of plastic material, durable and practical use. Color: White.
eBay
Portable Detachable Golf Flagsticks Putting Green Flags Hole Cup Set Golf Pin Flags for Driving Range Outdoor Backyard Sports
Aliexpress UK