The Product Was SUB PAR For Absorption And There Are NO Markings For The Front Or Rear. I Reached Out To CUSTOMER SERVICE Which Took TWO DAYS To Tell Me I Had To Pay For RETURN SHIPPING When The Company Says They Offer 100% Satisfaction. The Customer Service People Are HORRID! I Threw The Remaining Product Away!! I'm A VERY DISSATISFIED Customer Who Will NEVER Purchase Their Products Again!