Blue Temper Spring Steel 0.015 In Thick x 0.125 In Width x 300 Inch Length Thickness Tolerance ±0.001″ Width tolerance is ±0.010″. Length tolerance is ±1/2″. C1095 Blue Tempered and Polished Spring Steel. Rockwell hardness C 48-51. Complies with MIL-S-7947, AISI-1095, SAE- 1095, and AMS-5122. RETURN’S Where we are at fault. Item not as described, damaged or an obvious error on our part is guaranteed a full refund, inclusive of any & all shippingper our stated directions. RETURN DIRECTION’s; All returns MUST be in the original condition received. All returns MUST be shipped in the same manner as we shipped originally. ANY ADDITIONAL COST UP & BEYOND THE ORIGINAL COST, INCURRED IN RETURNING YOUR ITEM IS NOT REFUNDABLE. (if you choose to return an item at a higher rate than we originally shipped to you? This portion is NOT refundable) Refunds due because of a no error on our part are completed asan item refund only. Shipping is excluded. PLEASE feel free to contact us with any questions or concerns, as we strive for 100% satisfaction & happy customers. Items with a free shipping 20% restocking fee will apply.