With over 54 years of experience, Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Together with this core group of products, we continue to meet the needs our customers with our expanding range of fine art, hobby and craft supplies, our large selection of drawing room furniture, and our wide assortment of exclusively-designed products. Clamp Strip features a convenient cut guide lines to help align your job. The transparent clamping strip will automatically hold your material in place. It is safe with no risk of damage.