EVA foam sitting blocks are a popular product for use in mat based Pilates classes.
Yoga Studio Yoga & Pilates Head and Sitting Block Twin Pack –Yoga Studio Store
66fit Pilates Sitting and Head Block Set
Fitness Mad Sitting Block
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Yoga Studio Yoga & Pilates Sitting Block on OnBuy
Fitness Mad Unisex's Sitting 320 x 250 x 60mm Pilates Block, Blue, 350 x 250 x 60 mm, Blocks - Canada
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Yoga Studio EVA Foam Pilates Sitting Block –Yoga Studio Store
This large Pilates block is used to level the pelvis in Pilates or Yoga postures. Perfect for those looking for one block only, as the extra width
Pilates Sitting Block
Fitness Mad Pilates Sitting Block - Podium 4 Sport