Tapered wine bottle corks from Young's. They taper from approx 17mm to 21mm and are approx 30mm long. Should not be used in wine bottles which are being laid down.
Youngs Tapered Corks Pack of 30 Beer Cider Wine Making
Tapered Corks - For Wine Making, Dressing and Oil Bottles - Pack Of 12
Tapered Corks - Pack Of 12 For Wine Making And Home Brew Bottles
Soft Wood Corks of Tapered Cork Bungs Glass Stoppers for Wine and Beer Bottles
Bicycle Headset Bearings, Tapered to Straight Tube Headset Replacement, Tapered Straight Front Fork Stem Headset Bike Top Cap Expander Headset Replacement Bicycle Accessory (44/55mm)
