Yes. You can pick and mix any selection you wish. Individual waxes can be ordered here: https://encaustic.com/product-category/wax-block-singles/ or o a single sheet containing all colours with the order button at the bottom after you have filled in quantity(ies) per colour(s): https://encaustic.com/shop/easy-wax-block-mixed-ordering/
High quality wax colour blocks. SIZE: approximately: 11mm x 24mm x 42mm weighing 10 to 12 grams [ * 1 5/8″x7/16″x15/16″ weighing just under 1/2 oz.] Formulated to high safety standards using: Beeswax ; Paraffin Wax ; Carnauba Wax ; Micro Crystalline waxes ; Glycerine Palmitate / Stearate ; Pigments – see individual encaustic art wax block colours for unique colour specific information. *contain no resins or gums.