There are limited items in the game, and limited preps are not an exception to this. After the item is over limit, you do not find it from it's normal location.

Sleek rods are a bit different from this, however. The sleek rods are character specific damage reduction wands. The wands are hidden in the game in specific locations, which are different for every character. The game has predetermined locations where your sleek rods can be hidden. These locations are often referred to as sleek spots. The game chooses locations for your character's sleek rods randomly, although some possible locations are excluded in the generation due to alignment-based roleplay restrictions not allowing you to get the rods from those locations (EG. goodies don't have to kill a goodie mob to get their sleeks). After you have found your sleek spot, the wand always respawns into this same location for that character. The wand respawns for your character only and other characters cannot empty your location. There is some cooling time with the respawn, but otherwise you can reliably find your wand in that spot.

There are three kinds of sleek rods. Sleek amber rod, which gives aura spell, sleek black rod, which gives barrier spell and sleek sienna rod which gives shield spell. These three damage reduction spells are often abbreviated as ABS in forum jargon.