These blanks are made in Townsville, Queensland, by a small family business - we appreciate your consideration of our products. All our blanks are made from Premium Plywood produced from renewable plantation resources. All pieces are 3mm thick and come in bulk (not individual packaging). The jump ring holes can vary but most are 1.5mm diameter. I use a 8mm jump ring on my 3mm Premium Ply earrings. The blanks are ready for painting or staining. I recommend then sealing the product to ensure long term durability. Please ensure that these products are not accessible to children as they are small and not suitable for children under 6.