This heavy Stonehenge Aqua cold press block is made of 100 percent white cotton and features a paper weight of 140lb. This acid-free paper is brawnier than its cold press siblings and features a hearty texture that has the versatility to handle a myriad of techniques and the heft to take the plain air watercolorist wherever they wish to go. Buckle resistant and extremely durable, this block is glued along two long edges to hold each sheet flat while painting. Finely crafted and cost-efficient, Stonehenge Aqua provides effortless blending, lifting and control.