Silver Strikes....

12.100 Other instrumentalities. Other instrumentalities with which gaming is conducted must be designed, manufactured, approved, used, discontinued, destroyed, or otherwise disposed of in accordance with the provisions of this regulation applicable to chips and tokens, except as follows:
1. Such other instrumentalities must be of such shape, size, and design and have such other specifications as the chairman may approve or require; and
2. The chairman, in his sole and absolute discretion, may deny approval of instrumentalities other than chips and tokens or may grant approval subject to such conditions as he considers appropriate.
(Adopted: 6/87.)

Here is the site to Nevada Gaming Regulations. Go to Regulation 12, Chips and Tokens.

Regards, Jim