Ardent Concentrate & Infusion Sleeve A Specially Designed Silicone Sleeve For Your NOVA! You've been asking and it's finally here! This FDA approved, food-grade and BPA-free silicone sleeve makes decarbing concentrates and infusing even easier. Make more of your infused oils at a time or use it use it during decarb. The silicone sleeve has been specially designed to fit perfectly into the NOVA's inner canister and give it a full silicone lining.