These are replacement feet for the Corona 4 typewriter from nearly 100 years ago. These amazing machines typically still work great today, except the original rubber feet are long reduced to mush. I designed these to be nearly an identical replacement, but with the advantages of modern technology we can engineer materials that were previously impossible. I printed with NinjaFlex Black TPU (https://ninjatek.com/ninjaflex/), which is nearly indestructible (but a knife or scissors will cut it, just like rubber!), flexible, and pretty gripping on most surfaces. I print them at 100% infill (solid) for ultimate strength, but the feel is firm yet springy. These look and function very much like the original, but should last much longer and be far more durable. 

Some people may prefer the dull rubber look, but I actually think these are a superior look to rubber, and the glossy finish better matches (if black) or accents (if one of the amazing DUCO colors) the rest of the machine. Please ignore other's marketing claims that 3D printed feet have no grip, or that their feet are more "professional". Look at my reviews, these are beautiful and amazing typewriter feet being bought by collectors and dealers alike, I'm regularly told my feet are the best.

PS: Ebay's volume discount display is a bit confusing, each purchase is a SET OF FOUR feet, so picking "1" is one set of 4; "2" is 2 sets of 4 (8), etc.