There are 2 types shown: Smooth vs Serrated (toothed) blade wheels.
Hemline Tracing Wheel – Smooth or Serrated | Sewing, Dressmaking & Pattern Marki
Hemline Tracing Wheel Smooth or Serrated Sewing, Dressmaking Pattern Marker
Milward Eco Dressmaker Tracing Wheel Smooth Serrated Sewing Pattern Marker Aid
Dressmakers Carbons Tracing Paper Squared Paper Tracing Wheels Tool
Pattern Cutting Paper Spot Dot & Cross or Pattern Tracing Paper -Pattern Cutting
Clover Double Tracing Wheel for pattern tracing with adjustable seam allowances
