Manduka?s Recycled Foam Block is the first among equals ? consisting of over 50% recycled EVA foam, this lightweight yoga block provides unbeatable comfort, style and support Slip resistant with radius edges - edges that are rounded off for even more comfort during use Manduka's Recycled Foam Block isn't squishy like most... It gives outstanding support with its high density foam, and is extremely durable Features 0.6lb; 4? x 6" x 9? Contains between 50% - 75% recycled post-industrial and post-consumer EVA foam Radius edges for comfort and beauty High density, extreme durability, firm support Soft, comfortable grip that is also slip-resistant