These scales are aluminium. The pattern is done with a high end laser machine in-house. We can do custom designs too - feel free to contact us to discuss. You will receive 10 scales.
 
Large Size - 22.2mm x 35.8mm with a 8.9mm hole. Recommended ring sizes for this size scale are 16swg 5/16" (AR 5.2)
 
Small Size - 14.3mm x 22.2mm with a 5.6mm hole. Recommended ring sizes are 18swg 3/16" (AR 4.1)