Understanding UVA and UVB is a 10-page brochure that offers the latest information on ultraviolet radiation, which is emitted by the sun (and tanning lamps) and is the main cause of about 90 percent of all skin cancers. The brochure covers topics such as UVA and UVB radiation, and sunscreens, including the difference between UVA and UVB-blocking ingredients and what to look for in sunscreens. Additional discount for volume purchasing applies. Pricing is as follows : 1-99 = $.60/ 100-299 = $.53/ 300-499 = $.45/ 500-999 = $.40/ 1000- = $.31