The GOST-2 shapes match the anatomical contours of the shoulder, chest, upper arm, and petite lower extremities. Ideal for shoulder impingement, traditional gua sha applied to the back and spine, the IT Band, and more. A favorite of throwing athletes and the clinicians who treat them. Specifications: weight = 1.6 ounces, largest treatment edge length = 5 3/4 inches. Made in the USA. Ships same or next day via USPS Priority Mail for delivery in 2 to 3 business days! Upgrade to the 2 Tool Set for free 2 day shipping!