The BCA polycarbonate crystal card provides a surface to analyze/classify snow grains. Snow crystals placed on the card become recognizable and sizable. Ideal for sunnier climates, the BCA polycarbonate crystal card does not absorb as much radiation as the aluminum crystal card, which allows you to study snow crystals longer and more accurately. This small yet very informational tool will take your snow safety skills to a new level. BCA designed it&';s snow study tools in conjunction with North America&';s most experienced avalanche educators. BCA snow study tools allow you to gather all of the data you need, without breaking the bank. Comes included with the BCA Snow Study Kit. Specs SKU - C2018003010 Weight - 1.2 ounces / 35 g Dimensions - 6 x 4 in / 15 x 10 cm Highlight - 1, 2, and 3 mm grids Protective clear coat Crystal and snowpit &';cheat sheets&'; Lexan material does not conduct heat, which keeps the crystals from melting Warranty - 3 Year