No problem. No idea on value. What colour plastic are they made from? Are the bases brass, aluminium (shiny silver) or zinc (dull, darker grey)? What colour is the primer cap, and does it have any annulus, if so, what colour? Are there any primer crimps? Are these fired or live? What style of link are they in? Most probably regular GPMG pattern (M13).
My (fired) example of this round has a black plastic case, aluminium base, nickel primer cup with green annulus, held in place with three stab crimps. It also has fine lines running down the case from the base of the shoulder to about 1.5cm above the head. It is a later example headstamped “DAG 91”.
Any more details would be helpful. At Bisley, I seem to remember similar plastic blanks going singly without link for about 50p-