Abstract We introduce a class of 4-dimensional crystal melting models that count the BPS bound state of branes on toric Calabi-Yau 4-folds. The crystalline structure is determined by the brane brick model associated to the Calabi-Yau 4-fold under consideration or. equivalently. its dual periodic quiver. https://medicalwarehouses.shop/product-category/intermittent-catheters/