From the manufacturer:
Kaplan Premium Rosin is formulated using the original Kaplan recipe, which produces less dust, helping to keep the instrument cleaner.
Kaplan Premium Rosin is packed in an attractive case, designed for easy one-handed use. A dial at the bottom of the case allows the rosin to be turned, to avoid creating a groove, if desired. Light and Dark rosin options available.
-Case designed for one-handed use
-Formulated using the original Kaplan recipe handed down from -Ladislav Kaplan
-Designed and manufactured in the USA at our New York facility to the most stringent quality controls in the industry