The numbering of the size corresponds to the measured bearing rim circumference from edge to edge of the freshly prepared hoof. 

Our sizes and shape

For horses and bigger ponys we have a round shape (F for Front) and a longish shape (R for Rear). 
For smaller ponys wie have a mixed form of front and rear hoof shape (U for Uni)

F sizes: 290-400 mm in 10 mm steps

R sizes: 285-375 mm in 10 mm steps

U sizes: 225-275 mm in 10 mm steps

Click to enlarge…

Our biggest and smallest front shape F 400 and F 290

Our biggest and smallest rear shape R 375 and R 285

Our biggest and smallest shape for the little ones 275 and 225