Small but sturdy and comfortable. This small metal ballpoint pen made of sturdy Gr5 titanium, non-rusted material for durable use. Non-slip grip and ergonomic design provide black ballpoint pen great texture and hand feeling. Improved Refill: To solve the ink skipping issues from the previous batches, we have already switched to the LAMY brand short refill (#M22 F) for this small pocket pen. Please unscrew the metal tip from the pen for changing the refill. LAMY refill will give you more comfortable writing perfermances from now on. Keychain/Necklace friendly. The Mini sized pocket pen can be also combined with your necklace, key ring, backpack and carabiner. Easy to carry everywhere. Pen length: To make the pen more comfortable to your hands while writing, we make the pen a bit longer at 0.39" than the original version. It is now 3.50’’ in total length. Diameter: 0.39’’ excluding the clip; Weight: 0.033lb***If you found it’s unable to push the bolt switch or the refill can’t be stretched out and drew back,please check if the refill installed correctly -- the bottom of refill should completely touch the bottom of pen holder. A titanium bolt action mini pen with a ring to attach to your keychain or neck