The stones usually measured one half to three quarters of an inch [10 to 20 mm] in diameter, but some detailed sections used pebbles as small as a mere one quarter of an inch [5 mm].
لكنّ بعض التفاصيل الدقيقة تطلبت استعمال حصى لا يتجاوز قطرها الـ‍ ٥ مليمترات .‏