Sartorial Adventure — Berlin, 1932, rings with razor-sharp blades
Amazon.com: Rofusn Razor Blade Band Rings, Stainless Steel Goth Double Edge Blades Ring for Men Women-Black#7: Clothing, Shoes & Jewelry
Cold Steel 36MF Razor Sharp Carbon Battle Ring II Fixed Blade w/ Sheath 705442018759 | eBay
Rounded Razor Blade Ring Razor Sharp Ring Stainless Steel - Etsy
Razor's Edge Safety Knife - Utility Ring Knife for Finger with Sharp, Straight Blade - Ring Size 12 - Red - Pointed Tip - Dozen - By Handy Twine Knife - - Amazon.com
Handy Twine Knife Razor's Edge Metal Ring Knife, Straight Blade, Size 14, Box of 12 - KnifeCenter - HT04
Amazon.com: FORGICA-Barber Straight Razor Professional Straight Edge Razor for Men 300 Derby Blades - Single Ring Barber Razor Compatible with Double Edge Blade Beard Shaping tool, Titanium Beard Shaper (3 in 1