Jade Yoga Small Cork Block. Cork provides extreme comfort strength and stability offers firm support for your yoga practice and is naturally antimicrobial and water-resistant. Through its partnership with the Tropical Rain Forest Coalition JADE PRESERVES 100 SQUARE FEET OF RAIN FOREST FOR EACH BLOCK SOLD. And through our partnership with Trees for the Future JADE PLANTS A TREE FOR EVERY BLOCK SOLD. Package Contents: Jade Yoga Cork Blocks The Jade Yoga Cork Blocks is a quality addition to the Jade Yoga lineup. For more great deals on Yoga Mats by Jade Yoga please browse our Jade Yoga Women's Accessories page.