You will enjoy using a rib like this one to work on your large bowls and platters. Measuring about 7 long by 1-3/4 wide and 3/8 thick you can count
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Pottery Rib
Fish Scale Pottery
Wooden Pottery Rib Tool Triangular Pottery Making Tool
Triangular Ipe Pottery Tool, Rib, Bowl Rib, Platter Rib, Thick Ceramic Tool, Clay
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Wood Fish Platter
5 pieces wood potters ribs tool set can meet your different demands of modeling, suitable for a variety of shapes and uses Made of wood material,
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Wood Fish Platter
Bloodwood Triangular Footing Detailer Pottery Rib, Wood Platter Rib - Australia
Customizing The Bat Molds - Pure & Simple Pottery Products
globeagle Ceramic Pottery Ribs Tool Sets 5 PCS Wood Pottery Tools Clay Sculpting Ceramics Molding Tool Potters Rib Kits