Lanalux Flea Collar - Flea and Tick Prevention for Dogs One Size Fits All - Flea Control 8 Months Protection & Treatment Hypoallergenic Tick Collar Insect Repellent Collar with Natural Plant Extracts 12" Imperial Architect's Scale Inch, 1", 1/2", 1/4", 1/8", and 1/16" = 1'-0" scales One scale per side makes it easier to read than traditional scales Colored inserts for easier identification of scales Heavy weight, solid metal