Weights from the 10mm / 20mm weight tables. Add-ons: bar solar light 0.383kg · slate oil 0.173kg · solar down light 0.473kg · 2ft posts 5kg · 3ft posts 8kg (posts ship separately). Signs without a size from Shopify show a size picker — select a size and thickness to get the weight. Tap a weight chip to copy it (kg or grams) straight into Royal Mail.