Primos makes the finest friction calls on the market. Keep them sounding sweet with our wax-free Box Call Chalk.Instructions & ExercisesBox Calls:An Occasional light sanding in addition to chalking the wood contact surfaces with Box Call Chalk is all you’ll need to make your box calls last.Push-Pin Calls:Use Box Call Chalk on the underside of the paddle to keep your call sounding its best.Three pieces of wax-free chalkPlastic carrying case