Chalk is cheap. Lifting chalk removes moisture and dries the hands so that your client does not lose grip when performing certain exercises such as deadlifts and bent-over rows. Perfect way to enhance grip strength naturally without the use of straps or gloves. Can be a bit messy, so make sure it is approved for use in your gym.
This 300 Gram ( 10.58 oz ) Bag of Loose Gym Chalk 
provides a huge value and bang for your buck. Use it for weight lifting, gymnastics, rock climing and more.
