evo.com | BCA Snow Study Tools > Avalanche professionals, serious ski tourists and Avy Level II and above students will need the durable BCA Aluminum Crystal Card as part of their ongoing study of the snowpack. Protective clear coat Snow grain classification "cheat sheets" Aluminium 1 mm and 3 mm grids 6 x 4" (15 x 10 cm) | BCA Aluminum Crystal Card 2025 in Black
