Abstract: A casing for a writing instrument comprises an outer shaft, an inner shaft, and a nib. The outer shaft is formed using dual injection molding. An outer surface of the outer shaft includes a raised hard part and a raised soft part. The inner shaft is formed of a thin-wall tube having an upper end and a lower end, the inner shaft being configured for insertion inside the outer shaft. The inner shaft further includes a fastener protruding on its upper end that engages an upper end of the outer shaft. The nib is configured to engage the lower end of the inner shaft to help secure the inner shaft within the outer shaft. The raised hard or soft parts on the outer surface of the outer shaft may include an oblique loop-shaped part, a strip-shaped part, and/or an arc-shaped part.

Abstract: A safety ruler and guide used with a rotary cutter or the cutting tool for cutting fabric, the ruler designed to protect a user's first hand when holding the ruler on top of the fabric while the second hand is cutting the fabric with the cutting tool. The ruler has a vertical guard mounted exactly upright to a base guide, dividing the base equally into a first side and a second side. Each first side and second side display grids, ruler measurements and measuring scale to enable a right or left handed user to properly read and measure length and width of the fabric being cut. The first side and second side also include a ruler edge for measuring the length of fabric being cut, and serving as a guide and cutting edge for the rotary cutter. The user may then cut the fabric using the cutting tool without the cutting tool or fabric moving during cutting. In the event the cutting tool slips while cutting, the hand holding and applying pressure to the ruler is protected by the vertical guard.