- Made with 100% polyurethane - Foam construction shaped like natural rock - Gramicci branding for climbing culture nods - Squeezable stress relief design - Compact size fits in hand comfortably A foam stress ball shaped like a rock with Gramicci branding, because climbers needed a way to hold rocks even when they are not climbing. It is either peak brand awareness or just a really committed joke. Either way, it's a squeezable rock that helps with stress, which is honestly perfect for people whose hobbies involve hanging off actual rocks by their fingertips. Style Number: G6SA-258