This Pica BIG Dry refill lead set FOR ALL contains 12 pieces of leads that are especially for use with Big Dry longlife construction marker. The leads are made of graphite, which is water soluble and is suitable for most materials whether they are glossy, rough, dusty, oily, dry or wet. The product is delivered in a plastic box with two wings so that it can be opened easily to take out the leads. Lead colour: BlackLead material: GraphiteLead dimensions: 150 x 2 x 5 mm (L x W x H)Water solubleIncluding 12 graphite leadsFor most materials: Glossy, rough, dusty, oily, dry or wetDelivered in a sturdy plastic box with two wings for easy opening