What is this plant? Do they get large?

Stenocereus pruinosus. They can, but slowly. Repot immediately.
That fine quartz sand (best case scenario) will kill it eventually.

skopjecollection said:Stenocereus pruinosus. They can, but slowly. Repot immediately.
That fine quartz sand (best case scenario) will kill it eventually.

Ooooohhh! Thank you! Is that kind of sand bad for all plants? It's a fine colored sand. I have in a few other plants. The sand is also just for looks. I have real soil underneath it.

Soil is a subjective term. Its usually a mix of peat, vermicompost and topsoil, where as cacti like a mix of coarse sand, coarse volcanic material, perlite, and small percentage of the aforementioned organic material (>30%). The proper term is potting medium.
If you want decoration, you can use gravel or leca.

Ok, so is it bad for the plant to have the sand for a top dressing? For my dessert cacti I use a cactus soil mixed 50/50 with clay based kitty litter type of stuff.

As long as the litter is non clumping, its should be ok. But why satisfy with OK? Add that extra kick and its almost problem free
And yes, the sand is that bad. It will contain moisture, and accumulate water near the plant stem .

skopjecollection said:As long as the litter is non clumping, its should be ok. But why satisfy with OK? Add that extra kick and its almost problem free
And yes, the sand is that bad. It will contain moisture, and accumulate water near the plant stem .

This is what I actually use in about a 30/70 ratio with a cactus soil. I like it because it's heavier than perlite for top heavy plants. Looks more natural too. I think I'll get rid of the sand, thanks for the advice.