The Wild Country Helium Friends represent 30 years of experience building cams. From the very first, to the current day Wild Country was there. These cams continue the tradition with improvements to ergonomics and great weight savings compared to the older styles.12mm dynema sling.new designs are lighter and have more range than old styles.Size 0: Range 0.55-0.89" Weight 3.07oz.Size 0.5: Range 0.65-1.05" Weight 3.21oz.Size 1.0: range 0.78-1.25" Weight 3.35oz.Size 1.5: Range 0.93-1.5" Weight 3.67oz.Size 2.0: Range 1.12-1.80" Weight 3.84oz.Size 2.5: Range 1.35-2.18" Weight 4.13oz.Size 3.0: Range 1.65-2.66" Weight 5.11oz.Size 3.5: Range 2.02-3.25" Weight 6.03oz.Size 4.0: Range 2.49-4.01" Weight 7.34oz.