Squat Wedge Blocks Calf Raise Block Multi-Functional Calf Stretcher Board Non-Slip Cork Wedge Block Heavy Duty Squat Accessories. 1x Squat Wedge Block. Eco-Friendly andSturdy Material: Constructed from eco-friendly, non-toxic, and recyclable cork material, this calf stretcher board is not only sturdy and wear-resistant but also lightweight and easy to carry, making it a sustainable choice for fitness enthusiasts.