ProSource Cork Yoga Blocks (Set of 2) ECO-CONSCIOUS - Natural cork design is a fully sustainable and safe resource STRETCH FURTHER- Helps extend reach and make difficult poses more accessible GREATER STABILITY - Slightly heavier than foam, cork yoga blocks supported backbends, balance poses and various seated stretches SAFETY - Assists with proper alignment and form, assisting with balance. Ideal for prop-based lyengar yoga STURDY GRIP - Natural texture with rounded edges create acomfortable surface with solidtraction