TheStar Power Sticks were the second evolved, magical transformation items the Inner Sailor Senshi used. They were given to them by Luna along with new communicators.
Manga and Crystal
In the manga, the Inner Senshi were given the Star Power Sticks after they destroyed their own transformation pens in order to help Sailor Moon defeat Metalia. After the Sailor Senshi received power upgrades from Neo Queen Serenity, they no longer used the sticks to transform. In Sailor Moon Crystal: Season 3, the girls use the Star Power Sticks to transform, but in the manga, they didn't use anything as they called upon planet power to transform them.
These were used in the Sailor Moon R and Sailor Moon S seasons of the original anime, replacing the pens. In the fourth season of the original anime, they were replaced by the Crystal Change Rods that were granted to each Sailor Senshi by the great powers of Pegasus himself. They are used in the R movie to fight against the evil Xenian Blossom and her extraterrestrial servant and minion Fiore, as well as in the the S movie to fight Princess Snow Kaguya and her snow dancers.
The Star Power Sticks and the communicators in Crystal.
Merchandise based off of Mercury and Mars's Stars Power Sticks. The top parts of the wands are actually nail polish that you can pop out of the wand and use. Sold in 1993.
Merchandise based off of Venus and Jupiter's Star Power Sticks. The top parts of the wands are actually nail polish that you can pop out of the wand and use. Also sold in 1993. Also, it should be noted that unlike the other set of Star Power Sticks, this set is very rare and when sold, it can be very expensive.
The bottles of nail polish in the Miracle Romance Nail Polish collection are based off of the Star Power Sticks.