Acrylic Block for Clear Stamps Large £6.00 Out of stock: due soon. 0 in your basket View Basket Checkout Clear acrylic block in large square size for clinging acrylic or unmounted stamps on to get you stamping! By Viva Decor with placement grid on block. Place your stamp on this block, ink it up and stamp it down. Size of block is 10cm x 10cm x 1cm (4" x 4" x 3/8").