The DUVAL3-European and the Duval4-American are a totally new concept of all-in-one box+ shank and they are made in 5 different mixes of material, from lighter/supple to heavier/stronger
they fill a gap between traditional make and top-heavy 100% plastic pointe shoes
the difference between DUVAL3-European and the Duval4-American is the box shape:
more tapered for DUVAL3-European
wider/more roomy for Duval4-American , and accordingly bigger platform