These are cool metal straws used with a gourd to sip yerba mate the traditional way. We recommend boiling metal bombillas for 10 minutes to clean them before use. Do not use with very hot water. Join Nativa Rewards today to begin automatically receiving 5 points for each Nativa 2-Pound Bag, 3 points for each 1-Pound Bag, and 2 points for each Tea Bag Box purchased after enrollment. Redeem points for Steeping and Logo Accessories.