I wouldn't say these are ideal props for a betta. The wood isn't wide enough for a betta to swim through, but this is great for shrimp overall.

I should add that cholla is not a driftwood but the skeleton of the cholla cactus. Over the last 9 years of using cholla (12 years in the hobby) I noticed minimal tannins; not nearly as much as true driftwood. It's also "short lived" submerged and typically softens at the 3-5 year mark. I recommend using real wood for plecostomus. Cholla will work (it has cellulose and will grow aufwuchs, just not much of either) but it's not ideal and won't last long if eaten. If you want a wood that's better for plecos, will release tannins and last decades, mopani's the way to go.

6" x 2" diameter

Just boil it to get all of the microbes off then soak it till it gets water logged  Should sink after a day Good luck