byVivid Premium 99.9% Antibacterial Antimicrobial Yoga Block, Eco friendly Made of High Density Extra Firm & Stable EVA Foam (9 x 6 x 4) StayFreshTec & Odor Control Technology 100% ECO-FRIENDLY: byVivid Yoga Blocks emit zero waste and zero pollution during manufacturing. STAY FRESH TEC & ODOR CONTROL TECHNOLOGY: 99.9% Antibacterial and Antimicrobial properties our blocks are designed to keep your yoga block smelling fresh and clean after each use. HIGH DENSITY EXTRA FIRM EVA FOAM: Providing durable support when performing your exercises and stretches. 100% NATURAL RUBBER AND NO CHEMICALS ORGANIC YOGA MAT: Absolutely no chemicals, solvents or toxic substances are used in the production of our mats. These materials can cause skin irritation and discomfort. GREAT SIZE: Each Yoga Block is 9" x 6" x 4" making it the perfect size to use for Yoga, Pilates or other Exercises no matter if you are in the studio or at home.